Planarian Regeneration: A Visual Guide to the Process

Planarian regeneration is the process by which freshwater flatworms regrow complete organisms from small body fragments through the activity of adult pluripotent stem cells called neoblasts. This guide explains the stages of regeneration from amputation to full organism restoration, with visual descriptions suitable for students, researchers, life-science professionals, and informed general readers. The content focuses on the observable sequence of events, the cellular mechanisms that drive each stage, and the molecular signals that control polarity, size, and tissue identity. Practical guidance covers how to observe regeneration in a laboratory setting, what records to keep, and how to interpret common observations.

The Planarian Model System

Planarians have attracted increasing attention in the regeneration field because of their usefulness as biological model organisms, attributed to their strong regeneration ability. Both the complexity of multiple regulatory networks and their coordinate functions contribute to the maintenance of normal cellular homeostasis and the process of regeneration in planarians. The polarity, size, location, and number of regenerated tissues are regulated by diverse mechanisms. Recent reviews summarize advances about the importance of genetic and molecular mechanisms for regeneration control on various tissues in planarians, including neoblasts, the nervous system, eyespots, the excretory system, and the epidermis. Available molecular mechanisms give an overview of the regeneration process in every tissue type.

Freshwater planarians are among the organisms capable of stem cell-mediated whole-body regeneration and have served as an exemplary model to study how pluripotency is maintained and regulated in vivo. Most mammals cannot easily overcome degenerative disease or traumatic injuries, whereas an innate ability to regenerate is observed across animal phyla. Planarians possess naturally occurring pluripotent adult somatic stem cells required for homeostasis and whole-body regeneration. These stem cells persist throughout the organism's adult life and have been observed in various adult invertebrate phyla, playing crucial roles in biological processes including whole-body regeneration and asexual reproduction.

The planarian brain regeneration process can be divided into five steps: anterior blastema formation, brain rudiment formation, pattern formation, neural network formation, and functional recovery. This staged framework provides a useful visual model for understanding the broader regeneration process, as the brain is one of the most complex structures that regenerates.

At a Glance: Regeneration Stages and Key Features

The following table summarizes the major stages of planarian regeneration, the observable features at each stage, the approximate timing under standard laboratory conditions, and the key cellular or molecular events reported in the literature.

The timing values in this table represent general observations from the research literature and vary by species, fragment size, amputation plane, temperature, and culture conditions. Researchers should record their own timing data instead of assume fixed intervals.

Core Principles of Planarian Regeneration

Neoblasts as Pluripotent Adult Stem Cells

Planarians regenerate from tiny body fragments through a process requiring a population of proliferating cells called neoblasts. Whether regeneration is accomplished by pluripotent cells or by the collective activity of multiple lineage-restricted cell types was unknown until experiments using ionizing radiation and single-cell transplantation identified neoblasts that can form large descendant-cell colonies in vivo. These clonogenic neoblasts produce cells that differentiate into neuronal, intestinal, and other known postmitotic cell types and are distributed throughout the body. Single transplanted clonogenic neoblasts restored regeneration in lethally irradiated hosts. This evidence supports the conclusion that broadly distributed adult pluripotent stem cells underlie the remarkable regenerative abilities of planarians.

The neoblasts differentiate into tissue progenitors under the regulation of genes such as egfr-3. Tissue-specific genes regulate the tissue progenitor cells to differentiate into desired cell types to complete the regeneration process. All tissue types in planarians participate in the regeneration process, regulated by distinct molecular factors and cellular signaling pathways. The neoblasts play vital roles in tissue regeneration and morphology maintenance.

Organizer Regions and Polarity Control

An organizer is defined as a group of cells that secrete specific factors and can change the fate of adjacent cells and instruct a specific pattern. Spemann and Mangold first used the term in 1938 when they discovered that the dorsal blastopore lip of a salamander embryo induced a secondary axis after transplantation. Since then, several such regions have been identified in the embryos of many animal species. However, little was known about the presence of organizers at the adult stage, although some organizing activity must be required during regenerative processes to pattern the new tissue. Current knowledge on planarians identifies the anterior and posterior tips as regenerative organizers. The molecular networks that define each organizer have been characterized, and the presence of organizers in planarians during normal homeostasis has been discussed.

The regeneration polarity is controlled by the Wnt pathway, the BMP pathway, and bioelectric signals. Any planarian fragment regenerates the missing head and tail in the proper end. Early activation of the Wnt/β-catenin signaling pathway changes the chromatin accessibility of the cells of the posterior-facing wound to regenerate a tail. For successful regeneration, the identity of the missing tissue must be specified according to the pre-existing tissue. Planarians are ideal for the study of the mechanisms underlying this process because the same field of cells can regrow a head or a tail according to the missing body part. After amputation, the differential activation of the Wnt/β-catenin signal specifies anterior versus posterior identity. Initially, both wnt1 and notum, a Wnt inhibitor, are expressed in all wounds, but 48 hours later they are restricted to posterior or anterior facing wounds, respectively, by an unknown mechanism. Twelve hours after amputation, the chromatin accessibility of cells in the wound region changes according to the polarity of the pre-existing tissue in a Wnt/β-catenin-dependent manner. Genomic analyses suggest that homeobox transcription factors and chromatin-remodeling proteins are direct Wnt/β-catenin targets, which trigger the expression of posterior effectors.

Gradient Concepts and Morphogen Signaling

Planarian regeneration was one of the first models in which the gradient concept was developed. Morphological studies based on the analysis of the regeneration rates of planarian fragments from different body regions, the generation of heteromorphoses, and experiments of tissue transplantation led T.H. Morgan in 1901 and C.M. Child in 1911 to postulate different kinds of gradients responsible for the regenerative process in these highly plastic animals. After a century of research, the role of morphogens in planarian regeneration has yet to be fully demonstrated. The sequencing of the planarian genome and the possibility of performing gene functional analysis by RNA interference have led to the isolation of elements of the bone morphogenetic protein, Wnt, and fibroblast growth factor pathways that control patterning and axial polarity during planarian regeneration and homeostasis. Whether the actions of these molecules could be based on morphogenetic gradients remains an active research question.

Visual Stages of Planarian Regeneration

Stage 1: Amputation and Wound Response

The regeneration process begins with amputation, which can occur through natural fission, predation, or experimental cutting. The sense of injury and initiation of regeneration is regulated by diverse genes including follistatin and ERK signaling. Immediately after amputation, the wound site undergoes muscle contraction and the formation of a wound epithelium that seals the exposed tissue.

For visual observation, the wound response appears as a slight retraction of the cut edges within the first minutes to hours. The exposed internal tissue becomes covered by a thin transparent layer. Under a dissection microscope, this stage shows the planarian fragment with a clean cut surface and minimal bleeding or tissue loss.

Researchers should record the time of amputation, the species, the size of the fragment, and the amputation plane. These variables affect the subsequent timing of regeneration stages. Different species of planarians show variation in their regeneration processes, and comparative studies have examined regeneration in various species.

Stage 2: Early Molecular Signaling and Chromatin Changes

Within hours after amputation, molecular events prepare the wound region for regeneration. The differential activation of the Wnt/β-catenin signal specifies anterior versus posterior identity. Both wnt1 and notum are initially expressed in all wounds, but by 48 hours they are restricted to posterior or anterior facing wounds respectively. Twelve hours after amputation, the chromatin accessibility of cells in the wound region changes according to the polarity of the pre-existing tissue in a Wnt/β-catenin-dependent manner.

This stage is not visible externally but can be detected through molecular analysis. Researchers using RNA interference or gene expression analysis can observe these changes in fixed tissue samples. The visual guide for this stage relies on molecular imaging techniques such as in situ hybridization or reporter gene expression instead of direct observation of living animals.

Stage 3: Blastema Formation

The blastema is the visible outgrowth of unpigmented tissue that forms at the wound site. This structure contains proliferating neoblasts and their progeny. The neoblasts within the blastema differentiate into desired cell types and regenerate the missing tissues. Brain regeneration begins with anterior blastema formation as the first of five steps.

Visually, the blastema appears as a white or translucent cap at the cut surface, distinct from the pigmented body tissue. The size of the blastema grows over the first few days. Under a dissection microscope, individual cells are not visible, but the overall structure is clearly distinguishable from the original tissue.

For time-lapse documentation, researchers can capture images at regular intervals to track blastema growth. The blastema continues to expand and becomes patterned as regeneration proceeds. The timing of blastema appearance varies with temperature and species, so consistent culture conditions are essential for reproducible observations.

Stage 4: Polarity Establishment and Patterning

During this stage, the regenerating tissue acquires its correct anterior-posterior identity. The Wnt/β-catenin signaling pathway plays a central role in this process. The regeneration polarity is controlled by the Wnt pathway, the BMP pathway, and bioelectric signals. Endogenous bioelectrical patterns are an important regulator of anatomical pattern during embryogenesis, regeneration, and cancer. Three known classes of instructive bioelectric patterns exist: directly encoding, indirectly encoding, and binary trigger.

The visual manifestation of polarity establishment is subtle. The blastema begins to show regional differences in cell density and tissue organization. In head regeneration, the brain rudiment forms during this stage as the second step of brain regeneration. Pattern formation follows as the third step.

Researchers can assess polarity by observing the eventual formation of head structures at the anterior end and tail structures at the posterior end. Molecular markers for anterior or posterior identity can be visualized using in situ hybridization or immunohistochemistry.

Stage 5: Tissue Differentiation and Organ Formation

As regeneration proceeds, neoblasts differentiate into specific cell types under the control of tissue-specific genes. The neoblasts differentiate into tissue progenitors under the regulation of genes such as egfr-3. Tissue-specific genes regulate the tissue progenitor cells to differentiate into desired cell types to complete the regeneration process.

Visually, this stage shows the appearance of pigmented eyespots, the formation of the pharynx, and the reorganization of the nervous system. Brain regeneration proceeds through brain rudiment formation, pattern formation, and neural network formation. The eyespots appear as dark dots that become visible through the transparent blastema tissue.

The excretory system and epidermal tissues also regenerate during this period. Each tissue type regenerates through distinct molecular factors and cellular signaling pathways. The visual appearance of the regenerating organism gradually approaches that of a complete planarian, with proper body proportions and organ placement.

Stage 6: Functional Recovery

The final stage of regeneration involves functional integration of the new tissues. Brain regeneration includes neural network formation and functional recovery as the fourth and fifth steps. Motility recovery during the process of regeneration in freshwater planarians has been studied as a behavioral measure of functional restoration.

Visually, the regenerated planarian begins to move in a coordinated manner, responds to touch and light, and eventually resumes feeding. The regenerated eyespots become functional, allowing light detection. The pharynx regenerates and becomes capable of feeding behavior.

Researchers can assess functional recovery through behavioral assays, including locomotion tracking and response to stimuli. The time to functional recovery varies with the extent of amputation and the species. Recording the time to first coordinated movement, first response to touch, and first feeding provides quantitative measures of functional regeneration.

Molecular Regulation of Regeneration

Signaling Pathways Controlling Regeneration

Multiple signaling pathways coordinate the regeneration process. The sense of injury and initiation of regeneration is regulated by diverse genes like follistatin and ERK signaling. The regeneration polarity is controlled by the Wnt pathway, the BMP pathway, and bioelectric signals. The neoblasts within the blastema differentiate into desired cell types and regenerate the missing tissues.

RNA N6-methyladenosine modification participates in many biological processes, including stem cell self-renewal and differentiation, in particular the regeneration of haematopoietic stem cells and axons. Depletion of the m6A methyltransferase regulatory subunit wtap abolishes planarian regeneration, potentially through regulating genes related to cell-cell communication and cell cycle. Single-cell RNA-seq analysis reveals that wtap knockdown induces a unique type of neural progenitor-like cells characterized by specific expression of the cell-cell communication ligand grn. Depletion of m6A-modified transcripts grn, cdk9, or cdk7 partially rescues the defective regeneration of planarians caused by wtap knockdown. These findings reveal an indispensable role of m6A modification in regulating whole-organism regeneration.

Transcription Factors and Stem Cell Regulation

Forkhead box O proteins are pivotal regulators of stem cell functions. In the planarian Dugesia japonica, the conserved foxO gene DjfoxO is expressed in neoblasts, with elevated levels detected in the regenerative blastema during the regeneration process. Inhibition of FoxO signaling in planarians hinders the regeneration of missing tissues, including the central nervous system, eyespots, anterior intestinal branches, and pharynx. Knockdown of DjfoxO does not significantly affect the mitotic activity of neoblasts but impedes the production of lineage-specific progenitors, potentially via modulation of the Erk pathway. These findings elucidate the instructive function of FoxO signaling in regulating stem cell differentiation.

Zic genes in the freshwater planarian Schmidtea mediterranea are expressed in a subpopulation of neoblasts that includes adult pluripotent stem cells. Zic expression is needed for head regeneration and production of an anterior signaling center. Suppression of Wnt-β-catenin signaling underlies Zic-mediated head regeneration, reminiscent of Wnt-β-catenin suppression by vertebrate Zic genes.

Post-Translational Regulation

Post-translational modifications and the genes regulating phosphorylation, ubiquitylation, and chromatin remodeling play roles in planarian regeneration. Technological advances for identifying cellular targets of these processes fill gaps in knowledge of the signaling mechanisms that underlie regeneration in planarians. This information should inform how tissue repair can be stimulated in non-regenerative model organisms and in humans.

Pharmacological Modulation of Regeneration

Pharmacological inhibition analysis has been used to study the involvement of MEK mitogen-activated protein kinase and TGF-β receptor in planarian regeneration processes. These studies use specific inhibitors to block signaling pathways and observe the effects on regeneration outcomes.

Metformin, a widely used oral hypoglycemic agent for treating type 2 diabetes, has been investigated for its effects on planarian regeneration. Low concentrations of metformin significantly reduced the regeneration time of planarians. Transcriptome analysis identified 113 differentially expressed genes, including 61 upregulated and 52 downregulated genes. The gene DjCK1α, a key gene involved in regeneration, was significantly upregulated. Interference of DjCK1α prolonged the regeneration time of the eyespots of planarians cultured in water, while treatment with metformin did not promote the eyespot regeneration of the DjCK1α-interfered planarians. These results suggest that metformin accelerates planarian eyespot regeneration, potentially through the regulation of DjCK1α.

Weak magnetic fields have been investigated as a non-invasive approach to modulate regeneration. Reactive oxygen species signaling regulates cell behaviors and tissue growth in development, regeneration, and cancer. Weak magnetic fields of 200 μT inhibit ROS formation and block planarian regeneration. Research based on spin state theory and the radical pair mechanism suggests that across a broad range of field strengths from 0 to 900 μT, some weak magnetic field exposures should be able to inhibit while others promote ROS formation in a binary fashion. Data reveal that weak magnetic fields can be used for directed manipulation of stem cell proliferation, differentiation, and tissue growth in predictable ways for both loss and gain of function during regenerative growth. Superoxide has been identified as a specific reactive oxygen species being modulated.

Practical Observation and Documentation

Setting Up Regeneration Observations

To observe planarian regeneration, maintain planarians in clean freshwater culture conditions at a consistent temperature. Use a dissection microscope for visual observation of external structures. For detailed observation of internal structures, use a compound microscope with transmitted light or fixed and cleared specimens.

Select healthy adult planarians of similar size for regeneration experiments. Starve the animals for several days before amputation to reduce variability. Use a sterile scalpel or razor blade to make clean cuts at the desired amputation plane. Common amputation planes include pre-pharyngeal, post-pharyngeal, and through the pharynx.

Record the following information for each experimental animal: species, body length, amputation plane, culture temperature, and time of amputation. Assign unique identifiers to each fragment and maintain individual containers to track regeneration progress.

Time-Lapse Documentation

Time-lapse imaging provides a visual record of the regeneration process. Use a dissection microscope equipped with a camera and interval capture software. Capture images at regular intervals, such as every 30 minutes or every hour, depending on the duration of the experiment. Maintain consistent lighting and focus throughout the capture period.

For time-lapse videos, ensure that the culture medium remains clean and that the planarian fragment remains in the field of view. Use a cooled stage or temperature-controlled room to maintain consistent temperature during long captures. Compile the captured images into a video sequence using image processing software.

Time-lapse documentation reveals the dynamics of blastema growth, the appearance of eyespots, and the gradual restoration of body proportions. These visual records provide valuable data for comparing regeneration under different conditions.

Records and Measurements

Maintain a laboratory notebook or electronic database with the following records for each regeneration experiment: species, source of animals, culture conditions, amputation details, and daily observations. Measure and record the following parameters at defined intervals: blastema length, blastema width, time to eyespot appearance, time to pharynx appearance, time to first movement, and time to first feeding.

Photograph each fragment at defined time points using consistent magnification and orientation. Include a scale bar in each image for accurate measurement. Store images with metadata including date, time, animal identifier, and experimental conditions.

Quantitative measurements of regeneration timing provide data for statistical analysis. Compare regeneration times across species, amputation planes, and experimental treatments. Record any abnormalities in regeneration, including supernumerary structures, missing tissues, or delayed development.

Common Failure Patterns and Troubleshooting

Several common problems can affect regeneration observations. Contamination of culture water with bacteria or fungi can kill fragments or slow regeneration. Maintain clean culture conditions and change water regularly. Temperature fluctuations can alter regeneration timing, so maintain consistent temperature throughout the experiment.

Fragments that fail to form a blastema may indicate poor animal health, inadequate nutrition, or damage during amputation. Use healthy, well-fed animals and make clean cuts to minimize tissue damage. Fragments that form abnormal structures may indicate genetic or environmental perturbations. Record these abnormalities and investigate potential causes.

If regeneration fails entirely, verify that the animals are a species known to regenerate and that the culture conditions are appropriate. Some planarian species show variation in regeneration ability, and comparative studies have examined regeneration processes in various species.

Welfare and Safety Considerations

Planarians are invertebrate animals, and their use in research is subject to institutional policies that vary by jurisdiction. Researchers should consult their institutional animal care and use committee or equivalent body to determine applicable requirements. While planarians are not typically subject to the same regulations as vertebrate animals, ethical considerations apply to their use in research.

When performing amputations, use sterile instruments and minimize animal distress. Anesthetize planarians before cutting using approved methods such as cold exposure or chemical anesthetics. Follow institutional guidelines for the care and use of invertebrate animals.

Pharmacological treatments used in regeneration studies may have off-target effects. Follow material safety data sheets for all chemicals used. Dispose of chemical waste according to institutional and local regulations. Weak magnetic field exposure requires appropriate safety assessment, although the field strengths used in research are generally considered safe.

Limitations and Research Gaps

The molecular mechanisms of planarian regeneration are not fully understood. While many genes and pathways have been identified, the complete regulatory network remains to be characterized. The role of morphogens in planarian regeneration has yet to be fully demonstrated, despite a century of research. Whether the actions of BMP, Wnt, and FGF pathway molecules could be based on morphogenetic gradients remains an open question.

No reliable neoblast culture methods were available until recently, hindering mechanistic studies of pluripotency and the development of transgenic tools. Recent advances report robust methods for neoblast culture and delivery of exogenous mRNAs. Optimal culture media for the short-term maintenance of neoblasts in vitro have been identified, and transplantation studies show that cultured stem cells retain pluripotency for two days. Procedures that significantly improve neoblast yield and purity by modifying standard flow cytometry methods have been developed. These methods enable the introduction and expression of exogenous mRNAs in neoblasts, overcoming a key hurdle impeding the application of transgenics in planarians.

Heterologous reporter expression in planarians has been demonstrated using luminescent reporters to overcome the strong autofluorescence of planarian tissues. The approach is based on the introduction of mRNA through several nanotechnological and chemical transfection methods. Reporter expression is improved by altering untranslated region sequences and codon bias, facilitating the measurement of expression kinetics in both isolated cells and whole planarians using luminescence imaging.

Spatiotemporal transcriptomic analysis has provided a comprehensive three-dimensional transcriptomic landscape of planarian regeneration. A pluripotent neoblast subtype has been described, and depletion of its marker gene makes planarians more susceptible to sub-lethal radiation. Spatial gene expression modules essential for tissue development have been identified, and functional analysis of hub genes in spatial modules, such as plk1, shows their important roles in regeneration.

Professional Escalation Criteria

Researchers observing unexpected regeneration outcomes should escalate their observations to appropriate personnel. Consult a principal investigator or laboratory supervisor if regeneration fails completely, if abnormal structures form consistently, or if results contradict published findings. For unexpected animal health issues, consult a veterinarian or animal care specialist.

When results have implications for human health or regenerative medicine, consider consulting with colleagues in translational research. The mechanisms identified in planarian regeneration may inform approaches to stimulate tissue repair in non-regenerative organisms. However, direct translation of findings from planarians to mammals requires careful validation.

For researchers using pharmacological or physical interventions, consult safety officers regarding proper handling and disposal of chemicals and equipment. For studies involving magnetic field exposure, consult with experts in bioelectromagnetics to ensure appropriate experimental design and interpretation.

Frequently Asked Questions

What is a neoblast and why is it important for regeneration?

A neoblast is an adult pluripotent stem cell found in planarians. Clonogenic neoblasts produce cells that differentiate into neuronal, intestinal, and other known postmitotic cell types and are distributed throughout the body. Single transplanted clonogenic neoblasts restored regeneration in lethally irradiated hosts, demonstrating that broadly distributed adult pluripotent stem cells underlie the remarkable regenerative abilities of planarians.

How long does planarian regeneration take?

The duration of regeneration varies by species, fragment size, amputation plane, temperature, and culture conditions. Planarians can regenerate any lost body parts, including their heads, within a few days. Researchers should record their own timing data under their specific conditions instead of assume fixed intervals.

What controls whether a head or tail regenerates at a wound site?

The regeneration polarity is controlled by the Wnt pathway, the BMP pathway, and bioelectric signals. After amputation, the differential activation of the Wnt/β-catenin signal specifies anterior versus posterior identity. Initially, both wnt1 and notum are expressed in all wounds, but 48 hours later they are restricted to posterior or anterior facing wounds respectively.

Can any piece of a planarian regenerate a complete organism?

Planarians regenerate from tiny body fragments, a process requiring a population of proliferating cells called neoblasts. The ability to regenerate depends on the presence of neoblasts in the fragment and the proper activation of regeneration programs. Fragments from different body regions show different regeneration rates, which contributed to the development of gradient concepts in regeneration research.

What are the five steps of brain regeneration in planarians?

Brain regeneration can be divided into five steps: anterior blastema formation, brain rudiment formation, pattern formation, neural network formation, and functional recovery. The discovery of the nou-darake gene, which means brains everywhere in Japanese, provided significant insight because brain neurons are formed throughout the entire body as a result of loss of function of this gene.

How do researchers study the molecular mechanisms of regeneration?

Researchers use RNA interference for gene functional analysis, single-cell RNA sequencing for transcriptomic profiling, and pharmacological inhibition for pathway analysis. The sequencing of the planarian genome enabled the isolation of elements of the BMP, Wnt, and FGF pathways that control patterning and axial polarity during planarian regeneration and homeostasis.

What role do bioelectric signals play in regeneration?

Endogenous bioelectrical patterns are an important regulator of anatomical pattern during embryogenesis, regeneration, and cancer. Three known classes of instructive bioelectric patterns exist: directly encoding, indirectly encoding, and binary trigger. The regeneration polarity is controlled by the Wnt pathway, the BMP pathway, and bioelectric signals.

Can pharmacological agents affect planarian regeneration?

Pharmacological agents can affect regeneration. Metformin at low concentrations significantly reduced the regeneration time of planarians, potentially through the regulation of DjCK1α. Pharmacological inhibition analysis has been used to study the involvement of MEK mitogen-activated protein kinase and TGF-β receptor in planarian regeneration processes. Weak magnetic fields can modulate superoxide to control planarian regeneration.

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References and Further Reading

• NCBI Literature Resources. National Center for Biotechnology Information.
• PubMed. National Library of Medicine.
• An insight into planarian regeneration.. Cell proliferation, 2022.
• Clonogenic neoblasts are pluripotent adult stem cells that underlie planarian regeneration.. Science (New York, N.Y.), 2011.
• m(6) A promotes planarian regeneration.. Cell proliferation, 2023.
• Planarian organizers.. Seminars in cell & developmental biology, 2019.
• Post-translational regulation of planarian regeneration.. Seminars in cell & developmental biology, 2019.
• Gradients in planarian regeneration and homeostasis.. Cold Spring Harbor perspectives in biology, 2010.
• Brain regeneration from pluripotent stem cells in planarian.. Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 2008.
• Lophotrochozoan Zic Genes.. Advances in experimental medicine and biology, 2018.
• Pluripotency retention and exogenous mRNA introduction in planarian stem cells in culture.. 2023.
• Heterologous reporter expression in the planarian Schmidtea mediterranea through somatic mRNA transfection.. 2022.
• In vitro detection of marine invertebrate stem cells: utilizing molecular and cellular biology techniques and exploring markers.. 2024.
• Hox genes regulate asexual reproductive behavior and tissue segmentation in adult animals.. 2021.
• Molecular profiles, sources and lineage restrictions of stem cells in an annelid regeneration model.. 2024.
• The Role of Bioelectrical Patterns in Regulative Morphogenesis: An Evolutionary Simulation and Validation in Planarian Regeneration. IEEE Transactions on Molecular Biological and Multi-Scale Communications, 2025.
• FoxO is required for neoblast differentiation during planarian regeneration.. International Journal of Biological Macromolecules, 2024.
• Transcriptome Sequencing Analysis of the Effects of Metformin on the Regeneration of Planarian Dugesia japonica. Genes, 2025.
• Spatiotemporal transcriptomic atlas reveals the dynamic characteristics and key regulators of planarian regeneration. Nature Communications, 2023.
• Wnt/β-catenin signalling is required for pole-specific chromatin remodeling during planarian regeneration. Nature Communications, 2023.
• Weak magnetic fields modulate superoxide to control planarian regeneration. Frontiers of Physics, 2023.
• Study of possible involvement of MEK mitogen-activated protein kinase and TGF-β receptor in planarian regeneration processes using pharmacological inhibition analysis. Russian Journal of Developmental Biology, 2014.
• Motility recovery during the process of regeneration in freshwater planarians. Behavioural Brain Research, 2004.
• Regeneration processes in various species of planarians. Ontogenez, 2010.
• Regeneration processes in various species of planarians. Russian Journal of Developmental Biology, 2010.

This article is educational and does not replace institutional policy, professional advice, or applicable safety and regulatory requirements.