DNA Extraction Methods for Class 12: Educational Protocols and Concepts

DNA extraction is the foundational laboratory procedure that separates deoxyribonucleic acid from cellular components such as proteins, lipids, and carbohydrates, enabling downstream applications including polymerase chain reaction, sequencing, and genetic analysis. For Class 12 biology students, understanding DNA extraction methods bridges theoretical genetics with practical molecular biology skills. This article provides curriculum-aligned protocols, explains the underlying chemical principles, and offers guidance for safe and effective classroom implementation using readily available materials.

At a Glance: DNA Extraction Methods Comparison

Core Principles of DNA Extraction

Cellular Lysis and Membrane Disruption

The first step in any DNA extraction protocol involves breaking open cells to release their contents. Plant cells require additional mechanical disruption because their rigid cellulose cell walls resist chemical lysis. Animal cells, including buccal epithelial cells collected from cheek swabs, lyse more readily with detergent-based buffers. The Laboratory Quality Management System Handbook from the World Health Organization emphasizes that pre-analytical steps, including specimen processing and nucleic acid extraction, directly influence the reliability of downstream test results.

Detergents such as sodium dodecyl sulfate or simple dish soap disrupt the phospholipid bilayer of cell membranes. The hydrophobic tails of detergent molecules interact with the lipid membrane while the hydrophilic heads face outward, creating micelles that solubilize membrane components. This process releases DNA along with proteins, RNA, and other cellular debris into the extraction buffer.

Enzyme Inactivation and Protein Removal

Once cells are lysed, endogenous nucleases called DNases can rapidly degrade the released DNA. These enzymes require magnesium ions as cofactors for their activity. Two common strategies address this problem. The first involves chelating agents such as ethylenediaminetetraacetic acid (EDTA) or Chelex resin that bind divalent metal ions, removing the cofactors needed by nucleases. The second strategy uses proteolytic enzymes such as proteinase K to digest nucleases and other proteins into smaller peptides that no longer pose a threat to DNA integrity.

Salt concentration plays a critical role in protein removal. High concentrations of sodium chloride cause proteins to precipitate out of solution by neutralizing the charges that keep them soluble. In the classic salting-out method, proteins aggregate and can be removed by centrifugation or filtration, leaving DNA in the aqueous supernatant.

DNA Precipitation and Recovery

DNA is insoluble in alcohol because the negatively charged phosphate backbone requires water molecules for solvation. Adding cold ethanol or isopropanol reduces the dielectric constant of the solution, allowing sodium ions to neutralize the phosphate groups and causing DNA to precipitate. Cold ethanol produces a visible white precipitate that can be spooled onto a glass rod or collected by centrifugation. Isopropanol requires less volume but precipitates salts more readily, making ethanol the preferred choice for cleaner DNA preparations.

The Assay Guidance Manual from the National Center for Advancing Translational Sciences notes that nucleic acid quantification and quality assessment are essential before using extracted DNA in downstream assays. Spectrophotometric measurement at 260 nanometers quantifies DNA concentration, while the ratio of absorbance at 260 to 280 nanometers indicates protein contamination. Pure DNA typically shows a ratio of approximately 1.8, with lower values suggesting protein carryover.

Simple Classroom Protocol: DNA Extraction from Banana

Materials and Safety Considerations

This protocol uses food-grade materials that are safe for classroom use. Students should wear gloves and safety goggles to prevent contact with ethanol and detergent solutions. The Laboratory Biosafety Manual from the World Health Organization provides general guidance on safe laboratory practices, including proper handling of chemicals and waste disposal procedures appropriate for educational settings.

Materials required per student group include one ripe banana, 50 milliliters of distilled water, 5 milliliters of liquid dish soap, 1 gram of table salt, 10 milliliters of cold ethanol (stored in an ice bath), cheesecloth or a fine strainer, a glass beaker, a glass rod or wooden stirrer, and a test tube.

Step-by-Step Procedure

1. Peel the banana and place it in a resealable plastic bag. Add 50 milliliters of distilled water and mash thoroughly until no large chunks remain. This mechanical disruption breaks the cellulose cell walls.

2. Transfer the mashed banana mixture to a glass beaker. Add 5 milliliters of liquid dish soap and 1 gram of table salt. Stir gently for 5 minutes without creating excessive foam. The detergent lyses cell membranes while the salt helps precipitate proteins and protects the DNA from nucleases.

3. Filter the mixture through cheesecloth into a clean beaker. Squeeze the cloth to extract as much liquid as possible. The filtrate contains DNA along with dissolved proteins, RNA, and other cellular components.

4. Tilt the beaker and slowly pour 10 milliliters of ice-cold ethanol down the side so it forms a separate layer on top of the banana filtrate. Do not mix the layers.

5. Observe the interface between the ethanol and the aqueous layer. White, stringy DNA precipitate will appear within 1 to 2 minutes. Use a glass rod to gently spool the DNA at the interface.

6. Transfer the spooled DNA to a clean tube containing 1 milliliter of distilled water for observation under a microscope or for further analysis.

Expected Observations and Discussion Points

Students should observe a visible white precipitate at the ethanol interface. Under magnification, the DNA appears as long, thread-like fibers. This protocol demonstrates the key principles of cell lysis, protein precipitation, and alcohol-based DNA recovery. Students can discuss why the ethanol must be cold, why salt is necessary, and what would happen if the soap were omitted.

The self-perception of critical thinking in high school students through scientific inquiry on DNA extraction study published in Educational Process International Journal examined how hands-on DNA extraction activities support the development of scientific reasoning skills. The study found that inquiry-based laboratory exercises help students connect abstract genetic concepts to observable laboratory outcomes.

Alternative Educational Methods

Chelex Extraction for PCR-Ready DNA

Chelex resin provides a rapid, simple method suitable for educational PCR experiments. The resin contains chelating groups that bind metal ions, preventing nuclease activity during the boiling step. This method requires minimal equipment and produces DNA adequate for PCR amplification.

A comparative study of DNA extraction methods for LAMP assays published in BMC Infectious Diseases evaluated Chelex extraction alongside column-based and heating methods for molecular diagnosis. The study found that Chelex extraction detected 20 percent more positive infections than simple heating extraction, although column-based methods provided the highest sensitivity. The heating method produced false negatives, possibly due to the presence of PCR inhibitors that were not removed during extraction.

For classroom use, Chelex extraction involves adding a small amount of biological sample to a 5 percent Chelex suspension, incubating at 95 degrees Celsius for 10 minutes, vortexing, and centrifuging to pellet the resin and cellular debris. The supernatant contains DNA suitable for PCR. This method is inexpensive, requires no organic solvents, and can be completed in under 30 minutes.

Saline Mouthwash for Buccal Cell Collection

Buccal cells collected from the inside of the cheek provide a noninvasive source of human DNA for educational experiments. A modified method for DNA extraction from buccal cells published in Cureus demonstrated that cytobrush collection followed by immediate extraction yielded an average of 65.70 micrograms of DNA from schoolchildren aged 7 to 15 years. Samples stored at negative 20 degrees Celsius for 8 months still yielded 47.63 micrograms of DNA with purity ratios of 1.9, and functional quality above 90 percent for PCR amplification.

The protocol involves having students rinse their mouths with 10 milliliters of sterile saline solution for 30 seconds and expelling the rinse into a collection tube. The sample is centrifuged to pellet the buccal cells, the supernatant is discarded, and the cell pellet is resuspended in lysis buffer containing detergent and proteinase K. After incubation at 56 degrees Celsius for 30 minutes, protein precipitation and ethanol precipitation recover the DNA.

This method raises important ethical considerations for classroom use. Schools should obtain parental consent before collecting biological samples from minors, and students should never be required to provide samples. Alternative sources such as fruit or purchased tissue samples avoid these concerns entirely.

Column-Based Purification for Advanced Studies

Commercial DNA extraction kits use silica membranes that bind DNA in the presence of high concentrations of chaotropic salts. These kits produce higher-purity DNA than simple precipitation methods and are appropriate for advanced students preparing DNA for sequencing or quantitative PCR.

The Bioanalytical Method Validation Guidance from the U.S. Food and Drug Administration emphasizes that extraction methods must be validated for their intended use, with documented recovery, purity, and reproducibility. While this guidance targets regulated bioanalytical laboratories, the underlying principle applies to educational settings where students should understand that extraction quality directly affects downstream results.

Column-based methods follow a standard workflow. The sample is lysed in a buffer containing guanidine salts and detergent. The lysate is applied to a silica column and centrifuged, causing DNA to bind to the membrane. Wash buffers remove proteins, salts, and other contaminants. Finally, a low-salt elution buffer releases the purified DNA. This method typically yields DNA with 260/280 ratios between 1.8 and 2.0, suitable for sensitive applications.

Quality Assessment of Extracted DNA

Spectrophotometric Analysis

Spectrophotometry measures the absorbance of a DNA solution at specific wavelengths. Nucleic acids absorb strongly at 260 nanometers, while proteins absorb at 280 nanometers. The ratio of these absorbances indicates sample purity. A 260/280 ratio of approximately 1.8 indicates pure DNA, while lower values suggest protein contamination. The 260/230 ratio, comparing absorbance at 260 and 230 nanometers, detects contamination by chaotropic salts, carbohydrates, and other compounds that absorb at 230 nanometers.

The Assay Guidance Manual recommends that laboratories verify nucleic acid quantity and quality before proceeding with downstream applications. For educational purposes, students can use a spectrophotometer or nanodrop instrument if available, or they can estimate DNA concentration by comparing band intensity on an agarose gel against known standards.

Gel Electrophoresis Verification

Agarose gel electrophoresis provides visual confirmation of DNA integrity and size. Students load extracted DNA samples into wells of an agarose gel and apply an electric current. DNA migrates toward the positive electrode because of its negatively charged phosphate backbone. Ethidium bromide or safer alternatives such as GelRed stain the DNA, allowing visualization under ultraviolet light.

High-molecular-weight genomic DNA appears as a single high band near the loading wells, while degraded DNA shows a smear extending down the gel. RNA contamination appears as a diffuse band below the genomic DNA. This visual assessment helps students understand the relationship between extraction quality and DNA integrity.

A study on DNA extraction from roadkill animals published in PLOS ONE demonstrated that DNA quality degrades with time since death, with successful amplification possible up to 120 hours after death but with increasing degradation risk. This finding illustrates the importance of sample freshness and proper storage for maintaining DNA integrity, a concept relevant to students collecting their own samples.

Common Failure Patterns and Troubleshooting

Low DNA Yield

Insufficient DNA recovery often results from incomplete cell lysis, excessive shearing during mechanical disruption, or loss during purification steps. For plant samples, inadequate mashing fails to break cell walls completely. Students should mash samples thoroughly and ensure the detergent concentration is sufficient for membrane disruption. Overly vigorous mixing can shear high-molecular-weight DNA into fragments too small to precipitate effectively.

DNA Degradation

DNA appears as a smear on agarose gels when nucleases have degraded it during extraction. This problem typically arises from using nonsterile equipment, delaying the lysis step, or failing to inactivate nucleases quickly. Adding salt and chelating agents immediately after lysis helps protect DNA. Samples should be kept cold whenever possible, and extraction should proceed without unnecessary delays.

Protein Contamination

Low 260/280 ratios indicate protein carryover. This problem occurs when the protein precipitation step is incomplete or when the aqueous phase is contaminated during organic extraction. Students should ensure adequate salt concentration and allow sufficient time for protein precipitation. When using phenol-chloroform extraction, careful pipetting to avoid the protein interface is essential.

PCR Inhibition

Some samples contain compounds that inhibit polymerase enzymes, preventing successful amplification even when DNA is present. The comparative DNA extraction study found that simple heating extraction produced false negatives in LAMP assays, likely due to inhibitors. Plant tissues contain polyphenols and polysaccharides that coprecipitate with DNA and inhibit PCR. Additional purification steps, such as column-based cleanup or dilution of the extracted DNA, can resolve inhibition problems.

Documentation and Record Keeping

Laboratory Notebook Requirements

Students should maintain detailed laboratory notebooks documenting each extraction procedure. The Laboratory Quality Management System Handbook emphasizes that accurate record keeping is essential for ensuring the reliability and traceability of laboratory results. For educational settings, notebooks should include the date, sample description, protocol used, observations at each step, and final quality assessment results.

Standard notebook entries include the sample source and collection date, the exact protocol followed including any modifications, observations of color changes, precipitate formation, and unexpected results, spectrophotometric readings and calculated concentrations, gel electrophoresis images or descriptions, and conclusions about DNA quality and yield.

Quality Control Records

Students should record quality metrics for each extraction and compare results across different methods and sample types. This comparative approach helps students understand how extraction method choice affects DNA quality and yield. A class data table can compile results from multiple student groups, allowing discussion of variability and the importance of consistent technique.

The Bioanalytical Method Validation Guidance describes the importance of documenting method performance characteristics including accuracy, precision, and reproducibility. While this guidance applies to regulated laboratories, the underlying principles of systematic documentation and quality assessment are valuable habits for students to develop.

Safety and Ethical Considerations

Chemical Safety

Classroom DNA extraction protocols use household chemicals that present minimal risk when handled properly. Ethanol is flammable and should be kept away from open flames. Dish soap can irritate eyes, so safety goggles are recommended. Phenol-chloroform extraction, if performed in advanced classes, requires fume hood ventilation and appropriate personal protective equipment because of the toxicity and carcinogenicity of these organic solvents.

The Laboratory Biosafety Manual provides comprehensive guidance on risk assessment and safe laboratory practices. For educational settings, risk assessments should consider the chemicals used, the biological samples handled, and the potential for accidents. Schools should have appropriate first aid supplies and emergency procedures in place.

Biological Sample Ethics

When students extract DNA from their own cells, schools must address ethical considerations including informed consent, privacy, and sample disposal. Many schools choose to use plant or purchased tissue samples to avoid these issues entirely. If human samples are used, parental consent forms should explain the purpose of the activity, how samples will be handled, and how privacy will be protected.

The Laboratory Quality Management System Handbook notes that ethical considerations are integral to laboratory practice, including respect for sample donors and responsible handling of genetic information. Students should learn that DNA contains personal genetic information and that responsible scientists protect donor privacy.

Applications of DNA Extraction in Research

Agricultural and Environmental Monitoring

DNA extraction enables the study of microbial communities in agricultural and environmental samples. A study of the sunflower endosphere published in Plant Signaling and Behavior used DNA extraction and sequencing to characterize bacterial communities in sunflower roots and stems. The study found that Saccharibacteria and Acidobacteria dominated roots while Proteobacteria, Bacteriodetes, and Gemmatimonadetes dominated stems, demonstrating how extraction-based methods reveal microbial diversity.

Similarly, a study of electrogenic bacteria from soils published in Biotech used DNA extraction followed by 16S rRNA gene sequencing to identify bacteria capable of generating electricity in soil microbial fuel cells. The predominant phylum was Bacillota of the class Clostridia, comprising 50 percent of the anode community, with Pseudomonadota at 15 percent. These applications show students how DNA extraction supports environmental research.

Medical Diagnostics

DNA extraction is essential for molecular diagnosis of infectious diseases. A study of Chlamydia trachomatis infection published in Medicina used DNA extraction from venous blood samples for HLA typing to investigate genetic susceptibility to infection. The study found that the DRB1*13 allele significantly heightened the likelihood of infection, demonstrating how extracted DNA supports genetic association studies.

A study of Plasmodium falciparum drug resistance markers used Chelex-based DNA extraction from dried blood spots followed by nested PCR and restriction fragment length polymorphism analysis to detect the Pfmdr1 N86Y mutation. The study found that 94 percent of alleles were wild-type, 1 percent were mixed, and no mutant alleles were observed. This application shows students how extraction methods support public health surveillance.

Cancer Genetics

DNA extraction from tissue samples enables the study of genetic mutations in cancer. A study of odontogenic myxoma published in Modern Pathology extracted DNA from formalin-fixed, paraffin-embedded tissues for PCR and sequencing. The study found KRAS mutations in 18.18 percent of cases and PIK3CA mutations in 11.11 percent, while no CTNNB1 mutations were detected. This research demonstrates how extraction from challenging sample types, including preserved tissues, supports cancer genetics.

A study of metal accumulation in colon cancer tissues used DNA extraction to assess global DNA methylation in paired cancerous and non-cancerous colon tissues. The study measured 5-methylcytosine levels using ELISA-based quantification, linking environmental metal exposure to epigenetic changes. Students can learn how DNA extraction enables epigenetic as well as genetic analysis.

Wildlife Conservation

DNA extraction supports biodiversity research and wildlife conservation. The roadkill study published in PLOS ONE analyzed 817 tissue samples from 590 roadkill vertebrate specimens in Ecuador. DNA was successfully extracted and amplified from samples up to 120 hours after death, enabling species identification and parasite detection. The study recommended sampling liver tissue when possible because it produced the highest quality DNA.

Microbiome Research

DNA extraction enables the study of microbial communities associated with animals and humans. A study of the bull sperm microbiome used targeted next-generation sequencing of extracted DNA to characterize semen microbial communities. The study identified at least 15 bacterial phyla in semen samples and found that Actinobacteriota was more abundant in bulls with excellent semen quality, while Bacteroides fragilis was detected in 75 percent of low-quality sperm samples.

A metagenomic study of urine-derived fertilizer published in BMC Microbiology used shotgun metagenomic analysis of DNA extracted from fresh urine, stored urine, and struvite samples. The study found that Pseudomonadata dominated fresh and stored urine samples while Bacillota dominated struvite samples. These applications demonstrate the breadth of research enabled by DNA extraction.

Advanced Sequencing Technologies

Nanopore Sequencing

Nanopore sequencing technology, such as the MinION device, enables real-time DNA sequencing in portable formats. A study evaluating the MinION sequencer found that sequencing of lambda phage DNA and E. coli DNA achieved accuracy and identity levels of at least 90 percent. The study noted decreased accuracy with repeated nanopore use, indicating the need for caution when comparing runs from the same flow cell.

For educational settings, nanopore sequencing can provide students with hands-on experience in DNA sequencing after extraction. The NCBI Literature Resources provide access to sequencing databases and analysis tools that students can use to analyze their results.

Bioinformatics Analysis

After DNA extraction and sequencing, bioinformatics tools analyze the resulting sequence data. A study using BERT-based models for transcription factor binding site prediction published in Briefings in Bioinformatics demonstrated how machine learning approaches analyze DNA sequences to predict protein binding sites. The model achieved superior performance compared to other deep-learning approaches, showing students how computational analysis extends laboratory work.

Professional Escalation Criteria

Students and educators should recognize when extraction problems require professional consultation. Escalate to a laboratory supervisor or technical expert when DNA yields are consistently below expected values despite protocol adherence, when purity ratios fall outside acceptable ranges for the intended application, when PCR amplification fails repeatedly with extracted DNA, when unexpected bands or smears appear on gels, or when samples show visible contamination or discoloration.

For clinical or research applications, the Laboratory Quality Management System Handbook emphasizes that laboratories must have procedures for identifying and resolving quality problems, including root cause analysis and corrective actions. Educational settings should adopt similar systematic approaches to troubleshooting.

Frequently Asked Questions

What is the purpose of using salt in DNA extraction?

Salt provides sodium ions that neutralize the negative charges on the phosphate backbone of DNA. This neutralization reduces repulsion between DNA molecules and allows them to aggregate and precipitate. Salt also helps precipitate proteins by competing for water molecules, making the proteins less soluble and causing them to clump together for easier removal.

Why must ethanol be cold for DNA precipitation?

Cold ethanol reduces the solubility of DNA more effectively than room-temperature ethanol. Lower temperatures slow the activity of any remaining nucleases that could degrade the DNA. The cold temperature also promotes the formation of visible DNA precipitate that students can observe and spool, making the demonstration more effective.

Can DNA extraction be performed at home with household materials?

Yes, DNA can be extracted from fruits such as bananas, strawberries, or kiwi using dish soap, table salt, water, and cold ethanol or isopropanol. The procedure involves mashing the fruit to break cell walls, adding detergent to lyse membranes, adding salt to precipitate proteins, and layering cold alcohol to precipitate DNA. This home protocol demonstrates the same principles used in professional laboratories.

What is the difference between genomic DNA and plasmid DNA extraction?

Genomic DNA extraction isolates the entire chromosomal DNA of an organism, which is typically large and linear in eukaryotes. Plasmid DNA extraction specifically isolates small, circular DNA molecules found in bacteria. Plasmid extraction uses alkaline lysis to denature genomic DNA while leaving plasmid DNA intact, followed by neutralization that causes genomic DNA to precipitate while plasmids remain in solution.

How do I know if my extracted DNA is pure?

DNA purity is assessed using spectrophotometry. The absorbance ratio at 260 to 280 nanometers indicates protein contamination, with pure DNA showing a ratio of approximately 1.8. The ratio at 260 to 230 nanometers detects contamination by salts and carbohydrates, with values above 1.8 indicating acceptable purity. Gel electrophoresis provides visual confirmation of DNA integrity and the presence of contaminants.

Why does DNA extraction from plants require more steps than from animal cells?

Plant cells have rigid cellulose cell walls that must be broken mechanically before chemical lysis can access the cell membrane. Plant tissues also contain polyphenols and polysaccharides that can coprecipitate with DNA and inhibit downstream applications. Additional purification steps are often needed to remove these plant-specific contaminants.

What is the role of detergent in DNA extraction?

Detergent disrupts the phospholipid bilayer of cell membranes by inserting into the lipid structure and creating micelles. This solubilizes membrane components and releases the cellular contents, including DNA, into the extraction buffer. Without detergent, the cell membrane remains intact and DNA cannot be released.

How should extracted DNA be stored for future use?

DNA should be stored in a buffer such as Tris-EDTA at negative 20 degrees Celsius for short-term storage or negative 80 degrees Celsius for long-term storage. The EDTA in the buffer chelates magnesium ions needed by nucleases, protecting the DNA from degradation. Repeated freeze-thaw cycles should be avoided because they can shear DNA and reduce quality.

Related Diagnostic Guides

• DNA Ligation: Principles, Protocol, and Optimization
• Agarose Gel Electrophoresis of DNA: Principles and Protocol
• DNA Extraction from Fungi: Protocols for Yeast and Mold
• DNA Extraction from Soil: Protocols for Environmental Samples
• DNA Extraction from Water Samples: Methods for Environmental DNA

References and Further Reading

• Laboratory Quality Management System Handbook. World Health Organization.
• Laboratory Biosafety Manual. World Health Organization.
• Assay Guidance Manual. National Center for Advancing Translational Sciences.
• Bioanalytical Method Validation Guidance. U.S. Food and Drug Administration.
• NCBI Literature Resources. National Center for Biotechnology Information.
• Metagenome-based microbial community analysis of urine-derived fertilizer.. BMC microbiology, 2024.
• HLA-DR and HLA-DQ Polymorphism Correlation with Sexually Transmitted Infection Caused by Chlamydia trachomatis.. Medicina (Kaunas, Lithuania), 2024.
• Detection and Characterization of Electrogenic Bacteria from Soils.. Biotech (Basel (Switzerland)), 2023.
• From roads to biobanks: Roadkill animals as a valuable source of genetic data.. PloS one, 2023.
• Bacterial community structure of the sunflower (Helianthus annuus) endosphere.. Plant signaling & behavior, 2021.
• BERT-TFBS: a novel BERT-based model for predicting transcription factor binding sites by transfer learning.. Briefings in bioinformatics, 2024.
• Analysis of Oncogene Mutations in Odontogenic Myxoma.. Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc, 2025.
• Gauging the skin resident Leishmania parasites through a loop mediated isothermal amplification (LAMP) assay in post-kala-azar dermal leishmaniasis.. Scientific reports, 2022.
• Molecular surveillance of the Plasmodium falciparum Pfmdr1 N86Y mutation linked to antimalarial drug resistance in Mbouda, Cameroon.. 2026.
• Metal accumulation in paired colon cancer and adjacent tissues and its relationship with genotoxic and epigenetic biomarkers.. 2026.
• Microbial Landscape of Bull (&lt,i&gt,Bos taurus&lt,/i&gt,) Ejaculate: Assessment of Diversity and Link to Fertility.. 2026.
• Acceptance and commitment therapy (ACT)-based programs for reducing symptoms of depression, anxiety and/or stress applied to the educational context: An exploratory review.. 2026.
• MinION Sequencer Demonstrates Strong DNA Sequencing Accuracy and Identity.. 2026.
• Education and regular Feedback for Antimicrobial Stewardship in nursing homes: EduFAST study protocol.. 2026.
• Self-Perception of Critical Thinking in High School Students Through Scientific Inquiry on DNA Extraction. Educational Process: International Journal, 2025.
• Comparative DNA extraction methods to use for LAMP assay as molecular diagnosis of human schistosomes from urine samples. BMC Infectious Diseases, 2025.
• A Modified Method for DNA Extraction From Buccal Cells for Genetic Epidemiological Studies Among Children. Cureus, 2024.
• An effective method for high purity genomic DNA extraction from N. 2016.
• Defective human leukocyte antigen class I-associated antigen presentation caused by a novel β2-microglobulin loss-of-function in melanoma cells. Journal of Biological Chemistry, 2006.

This article is educational and does not replace validated laboratory procedures, institutional biosafety review, manufacturer instructions, or professional interpretation.