Proofreading DNA Polymerases for Cloning

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-27

Quick Answer

Select a proofreading DNA polymerase with 3' to 5' exonuclease activity when amplifying inserts for cloning to minimize sequence errors that can disrupt protein function or regulatory elements.
Compare published error rates and review the enzyme's processivity and amplicon length limits before choosing a polymerase for your specific insert size and GC content.
Proofreading polymerases do not eliminate all mutations, and their slower extension rates and primer requirements can introduce their own experimental constraints.

At a Glance

Polymerase Type	Proofreading Activity	Typical Error Rate	Best Use in Cloning
Non-proofreading (Taq)	None	Higher	Routine screening, colony PCR, diagnostic amplification
Proofreading (Pfu, Phusion, Q5)	3' to 5' exonuclease	Lower	Amplifying inserts for expression vectors, mutagenesis, sequence-critical constructs
High-fidelity blends	Varies by formulation	Varies	Long amplicons or difficult templates where a balance of fidelity and yield is needed

Understanding Proofreading DNA Polymerases

The Core Mechanism of 3' to 5' Exonuclease Activity

DNA polymerases synthesize new DNA strands by adding nucleotides to a growing primer. During this process, a polymerase can occasionally incorporate an incorrect nucleotide. The enzyme's ability to detect and remove that mistake before continuing synthesis is what distinguishes proofreading polymerases from non-proofreading ones.

The proofreading function relies on a separate catalytic domain with 3' to 5' exonuclease activity. When the polymerase inserts a mismatched base, the extension reaction stalls. The enzyme then transfers the primer terminus from the polymerization site to the exonuclease site, removes the incorrect nucleotide, and returns the DNA to the polymerization site to continue synthesis. This editing process reduces the frequency of errors that become fixed in the final PCR product.

The efficiency of this proofreading step varies among polymerases. Some enzymes have a more active exonuclease domain, while others balance proofreading with polymerization speed. This balance matters for cloning because the final insert sequence must match the intended sequence, especially when the insert encodes a protein or contains regulatory elements.

How Polymerases Differ in Fidelity

Polymerase fidelity is not a single fixed number. It depends on the enzyme's intrinsic error rate, the reaction conditions, the template sequence, and the number of amplification cycles. Published error rates are typically expressed as mutations per base per duplication, but these values are measured under specific conditions and may not translate directly to your reaction.

Non-proofreading polymerases such as Taq have a higher error rate because they lack the 3' to 5' exonuclease domain. They are useful for routine screening and diagnostic PCR where a few errors do not affect the outcome. Proofreading polymerases such as Pfu, P3, and Q5 have a lower error rate because they can edit mistakes during synthesis.

The choice between these enzymes depends on the downstream application. If you are cloning a gene for protein expression, a single amino acid substitution can alter protein folding, activity, or stability. If you are cloning a promoter or a regulatory sequence, a single nucleotide change can disrupt transcription factor binding. In these cases, a proofreading polymerase is the appropriate choice.

The Role of PCR in Cloning Workflows

PCR is a standard method for generating inserts for cloning. The amplified product is then inserted into a plasmid vector using restriction enzymes, ligation, or assembly methods. The fidelity of the PCR step determines the sequence integrity of the final construct.

The National Library of Medicine provides a gateway to authoritative laboratory-method references that describe the standard steps in molecular cloning workflows. These references emphasize the importance of designing primers, optimizing reaction conditions, and verifying the final sequence. The choice of polymerase is one of the earliest decisions in this workflow, and it affects every downstream step.

When you amplify an insert for cloning, you are beyond generating a copy of the template. You are generating a population of molecules that may contain errors. The polymerase's error rate determines the proportion of molecules that carry at least one mutation. For a long insert, even a low error rate can produce a significant number of mutated molecules. This is why the polymerase choice is a practical decision that affects the success of the cloning experiment.

Selecting a Polymerase for Cloning

Matching Polymerase to Insert Size and Complexity

The size of the insert is a primary consideration when selecting a polymerase. Proofreading polymerases can amplify long fragments, but their processivity and extension rate may differ from non-proofreading enzymes. Some proofreading polymerases are optimized for long-range amplification, while others are better suited for shorter fragments.

The complexity of the template also matters. GC-rich templates, repetitive sequences, and templates with strong secondary structure can be difficult to amplify. Some proofreading polymerases are formulated with additives or engineered for these templates. The enzyme's ability to handle these templates affects the yield and fidelity of the PCR product.

For a typical cloning insert of 1 to 3 kilobases, most proofreading polymerases will perform well. For inserts larger than 5 kilobases, you may need a polymerase with higher processivity or a specialized long-range formulation. For inserts with high GC content, you may need to adjust the reaction buffer or use an enzyme that tolerates these conditions.

Comparing Error Rates and Published Specifications

Manufacturers publish error rates for their polymerases, but these numbers are measured under specific conditions. The error rate is typically expressed as the number of errors per base per duplication. A lower number indicates a higher fidelity.

When comparing polymerases, you should consider the error rate in the context of your insert length and the number of amplification cycles. A polymerase with an error rate of 1 in 1 million bases will produce a different number of mutated products than a polymerase with an error rate of 1 in 100,000 bases. The difference becomes more significant for longer inserts and higher cycle numbers.

The published error rates are a useful starting point, but they do not guarantee the same performance in your hands. The actual error rate depends on the reaction conditions, the template, and the enzyme's activity. You should verify the sequence of your final clone, especially if the insert is long or the gene is sensitive to mutations.

The Role of Processivity and Extension Rate

Processivity is the number of nucleotides a polymerase can incorporate before it dissociates from the template. A polymerase with high processivity can amplify longer fragments more efficiently. The extension rate is the speed at which the polymerase adds nucleotides.

Proofreading polymerases often have a lower extension rate than non-proofreading polymerases because the proofreading step takes time. This is a tradeoff: you accept a slower reaction in exchange for higher fidelity. For most cloning applications, the slower extension rate is not a problem, but it can affect the total reaction time.

The processivity and extension rate are not always listed in the enzyme's specifications. You may need to consult the manufacturer's documentation or the published literature to find these values. The Addgene protocols provide practical context for planning PCR workflows, including the typical extension times for different polymerases. This is a useful reference for estimating the total reaction time.

The Role of Buffer Composition and Additives

The buffer composition affects the polymerase's activity and fidelity. Most proofreading polymerases come with a proprietary buffer that is optimized for the enzyme. Using the correct buffer is important because the magnesium concentration, pH, and salt content affect the polymerase's ability to proofread.

Some buffers include additives that improve the polymerase's performance on difficult templates. These additives can include DMSO, betaine, or other compounds that reduce secondary structure. The manufacturer's instructions will specify the recommended buffer and any additives that are required.

You should not assume that a buffer from one polymerase will work with another. The buffer is formulated for the specific enzyme, and using the wrong buffer can reduce the polymerase's activity or fidelity. This is a common source of PCR failure, and it is worth checking the buffer composition before starting a reaction.

Practical Workflow for High-Fidelity Cloning

Step 1: Design Primers with the Insert and Vector in Mind

Primer design is the first step in a high-fidelity cloning workflow. The primers must be specific to the template and include any sequences needed for the cloning method. For restriction enzyme cloning, the primers include restriction sites. For assembly methods, the primers include overlaps with the vector.

The primer length and melting temperature affect the specificity of the PCR. A primer that is too short may bind to multiple sites in the template. A primer that is too long may have a high melting temperature that requires a higher annealing temperature. The primer design should be checked for secondary structure and self-complementarity.

The primer sequence also affects the fidelity of the PCR. A primer with a mismatch at the 3' end can reduce the polymerase's ability to extend. The primer should be designed to match the template sequence exactly, except for the intended restriction sites or overlaps.

Step 2: Set Up the PCR Reaction

The PCR reaction includes the template, the primers, the polymerase, the buffer, and the nucleotides. The amount of template and the number of cycles should be optimized for the specific reaction. Too much template can produce non-specific products, while too little template can produce a weak product.

The reaction volume and the concentration of the components should follow the manufacturer's recommendations. The polymerase is typically added last to avoid degradation. The reaction should be mixed gently and centrifuged briefly to collect the contents.

The thermal cycling conditions depend on the polymerase and the primer melting temperatures. The denaturation temperature is typically 95 degrees Celsius, but some polymerases require a lower denaturation temperature. The annealing temperature is determined by the primer melting temperature. The extension temperature is typically 68 to 72 degrees Celsius, but the optimal temperature depends on the polymerase.

Step 3: Run the PCR and Verify the Product

After the PCR, the product should be verified by agarose gel electrophoresis. The gel should show a single band of the expected size. If there are multiple bands or a smear, the PCR conditions may need to be optimized.

The product can be purified using a commercial kit or by gel extraction. The purification removes the polymerase, the primers, and the nucleotides. The purified product is then used for the cloning reaction.

The sequence of the final clone should be verified after the cloning is complete. This is the only way to confirm that the insert has the correct sequence. The sequence verification is especially important for genes that are sensitive to mutations.

Step 4: Clone the Insert into the Vector

The purified PCR product is inserted into the vector using the chosen cloning method. The method depends on the design of the primers and the vector. The ligation or assembly reaction is then transformed into competent cells.

The transformed cells are plated on selective media. The colonies are screened for the presence of the insert. The positive clones are then sequenced to confirm the insert sequence.

The cloning efficiency depends on the quality of the PCR product and the cloning method. A high-fidelity PCR product is more likely to produce a correct clone. The sequence verification is the final step in the workflow.

Records and Measurements for Fidelity Control

Tracking Polymerase Performance Across Experiments

The performance of a proofreading polymerase can vary between experiments. The error rate is not a fixed property of the enzyme. It depends on the reaction conditions, the template, and the enzyme's activity. To maintain control over the fidelity of your cloning, you should track the polymerase's performance across experiments.

A simple record of the polymerase lot, the reaction conditions, and the sequence verification results can help you identify trends. If you see an increase in the number of mutated clones, you can check the polymerase lot or the reaction conditions. This record is a practical tool for troubleshooting.

The record should include the polymerase name, the lot number, the reaction conditions, and the sequence verification results. This information can be used to compare the performance of different polymerases and to identify the source of errors.

Measuring the Error Rate in Your Own Hands

The published error rate is a starting point, but the actual error rate in your hands may be different. You can measure the error rate by sequencing a number of clones from a single PCR reaction. The number of mutations divided by the total number of bases sequenced gives an estimate of the error rate.

This measurement is not a formal assay, but it can provide a practical estimate of the polymerase's performance. The measurement is affected by the number of clones sequenced and the length of the insert. A larger sample size gives a more reliable estimate.

The measurement should be repeated if the polymerase or the reaction conditions change. The error rate can change with the polymerase lot, the buffer, or the template. The measurement is a way to verify the polymerase's performance in your hands.

The Role of Sequence Verification in Cloning

Sequence verification is the final check for the fidelity of the PCR product. The sequence of the insert should be compared to the expected sequence. Any differences should be evaluated for their effect on the gene or the regulatory elements.

Sequence verification is not optional for cloning. It is the only way to confirm that the insert has the correct sequence. The sequence verification is especially important for genes that are sensitive to mutations.

The sequence verification can be done by Sanger sequencing or by next-generation sequencing. The choice of method depends on the number of clones and the length of the insert. The sequence verification is a standard step in the cloning workflow.

Common Failure Patterns and Troubleshooting

The Problem of Low Fidelity in the PCR Product

The most common failure pattern in high-fidelity cloning is the presence of mutations in the final clone. This can be caused by the polymerase's error rate, the reaction conditions, or the template. The mutations can be silent, but they can also change the protein sequence.

The first step in troubleshooting is to verify the sequence of the PCR product. If the product has mutations, the polymerase or the reaction conditions should be changed. The polymerase can be replaced with a higher-fidelity enzyme. The reaction conditions can be adjusted to reduce the error rate.

The error rate can be reduced by using fewer amplification cycles. The error rate increases with the number of cycles because the errors are amplified. The number of cycles should be kept to the minimum needed to produce the product.

The Problem of Low Yield or No Product

A proofreading polymerase can produce a low yield or no product if the reaction conditions are not optimal. The polymerase may be inhibited by the template or the buffer. The primer may not be specific to the template. The annealing temperature may be too high or too low.

The first step is to check the reaction conditions. The annealing temperature should be adjusted to the primer melting temperature. The extension time should be adjusted to the insert length. The template concentration should be adjusted to the reaction.

The polymerase can be inhibited by the template or the buffer. The template should be purified and the buffer should be the manufacturer's recommended buffer. The polymerase should be added last to avoid mixing.

The Problem of Non-Specific Products

Non-specific products can be caused by the primer binding to multiple sites in the template. The primer should be checked for specificity. The annealing temperature should be increased to reduce non-specific binding. The template concentration should be reduced to reduce the number of non-specific products.

The non-specific products can be separated from the specific product by gel electrophoresis. The specific product can be purified from the gel. The purification is a standard step in the cloning workflow.

The non-specific products can also be caused by the polymerase's activity. The polymerase can extend from a primer that is bound to a non-specific site. The reaction conditions should be optimized to reduce the non-specific products.

The Problem of Polymerase Errors in the Final Clone

The final clone can contain mutations even if the PCR product is correct. The mutations can be introduced during the cloning process. The cloning method can introduce errors, and the sequence verification is the only way to confirm the clone.

The mutations can be caused by the restriction enzymes, the ligation, or the assembly method. The restriction enzymes can cut the DNA at non-specific sites. The ligation can introduce errors. The assembly method can introduce errors.

The sequence verification is the final step in the cloning workflow. The sequence of the clone should be verified to confirm the insert sequence. The sequence verification is important for the cloning of a gene for expression.

Biosafety and Regulatory Context for Cloning

The Role of Institutional Oversight in Recombinant DNA Work

The cloning of recombinant DNA is subject to institutional oversight. The NIH Guidelines for Recombinant or Synthetic Nucleic Acid Molecules provide the official framework for this oversight. The guidelines describe the risk assessment and the containment requirements for recombinant DNA work.

The institutional biosafety committee is responsible for reviewing the research and ensuring that the work is conducted safely. The committee reviews the risk assessment and the containment. The committee also reviews the training of the personnel.

The guidelines are not a set of fixed rules. They are a framework for the risk assessment. The risk assessment is based on the properties of the vector, the insert, and the host. The containment is based on the risk assessment.

The Role of Biosafety in the Laboratory

The biosafety principles are described in the Biosafety in Microbiological and Biomedical Laboratories (BMBL) manual. The manual provides the principles of biosafety, the risk assessment, and the containment. The manual is a reference for the laboratory.

The biosafety principles include the use of the appropriate containment, the use of the appropriate practices, and the use of the appropriate equipment. The containment is based on the risk assessment. The practices are based on the containment.

The biosafety principles are important for the cloning of recombinant DNA. The cloning can involve the use of the vectors and the host. The risk assessment is based on the properties of the vector, the insert, and the host.

The Risk Assessment for the Cloning of the Insert

The risk assessment for the cloning of the insert is based on the properties of the insert. The insert can be a gene, a regulatory element, or a sequence. The risk is based on the properties of the insert and the host.

The risk assessment is a process that is based on the properties of the vector, the insert, and the host. The risk is based on the potential for the insert to cause harm. The risk is assessed by the institutional biosafety committee.

The risk assessment is a part of the research. The risk assessment is based on the properties of the vector, the insert, and the host. The risk is assessed by the institutional biosafety committee.

Quality Control and Reproducibility in Cloning

The Role of Controls in PCR and Cloning

The controls are an important part of the PCR and the cloning. The controls are used to verify the performance of the reaction. The controls include the positive control, the negative control, and the no-template control.

The positive control is a reaction that is known to produce a product. The positive control is used to verify the performance of the polymerase and the buffer. The negative control is a reaction that is known to produce no product. The negative control is used to verify the absence of contamination.

The no-template control is a reaction that contains no template. The no-template control is used to verify the absence of contamination. The controls are an important part of the PCR and the cloning.

The MIQE guidelines provide a framework for the reporting of the qPCR experiments. The guidelines are a reference for the reporting of the qPCR experiments. The guidelines are not a set of fixed rules. They are a framework for the reporting of the qPCR experiments.

The Role of Standards and Calibration in the Laboratory

The standards and the calibration are an important part of the laboratory. The standards are used to verify the performance of the instruments. The calibration is used to verify the accuracy of the measurements.

The NIST laboratory programs provide a reference for the measurement science. The NIST programs are a reference for the standards and the calibration. The NIST programs are not a set of fixed rules. They are a reference for the measurement science.

The standards and the calibration are an important part of the PCR and the cloning. The instruments are used to measure the product. The instruments are calibrated to verify the accuracy of the measurements.

The Reproducibility of the PCR and the Cloning

The reproducibility of the PCR and the cloning is an important part of the research. The reproducibility is based on the consistency of the reaction conditions. The reaction conditions are the same for each reaction.

The reproducibility is based on the consistency of the polymerase, the buffer, and the template. The polymerase is the same for each reaction. The buffer is the same for each reaction. The template is the same for each reaction.

The reproducibility is affected by the variation in the reaction conditions. The variation can be caused by the pipetting, the temperature, and the time. The variation can be reduced by the use of the controls and the standards.

Common Failure Patterns in High-Fidelity Cloning

The Failure of the PCR to Produce the Correct Product

The PCR can fail to produce the correct product. The failure can be caused by the primer design, the reaction conditions, or the polymerase. The failure is a common problem in the PCR.

The first step is to check the primer design. The primer should be specific to the template. The primer should have the correct melting temperature. The primer should not have a secondary structure.

The reaction conditions should be checked. The annealing temperature should be adjusted to the primer melting temperature. The extension time should be adjusted to the insert length. The template concentration should be adjusted to the reaction amount.

The polymerase should be checked. The polymerase should be the correct one for the reaction. The polymerase should be stored and handled correctly.

The Failure of the Cloning to Produce the Correct Clone

The cloning can fail to produce the correct clone. The failure can be caused by the cloning method, the vector, or the insert. The failure is a common problem in the cloning.

The cloning method should be checked. The method should be the correct one for the insert and the vector. The method should be performed correctly.

The vector should be checked. The vector should be the correct one for the insert. The vector should be prepared correctly.

The insert should be checked. The insert should be the correct one for the vector. The insert should be prepared correctly.

The Failure of the Sequence to Be Correct

The sequence of the clone can be incorrect. The failure can be caused by the PCR, the cloning, or the sequencing. The failure is a common problem in the cloning.

The PCR product should be checked. The PCR product should be the correct one for the insert. The PCR product should be purified correctly.

The cloning should be checked. The cloning should be the correct one for the insert and the vector. The cloning should be performed correctly.

The sequencing should be checked. The sequencing should be the correct one for the insert. The sequencing should be performed correctly.

The Role of the Polymerase in the Cloning Workflow

The Polymerase as a Decision Point in the Cloning

The polymerase is a decision point in the cloning workflow. The choice of the polymerase affects the fidelity of the PCR product. The choice of the polymerase is based on the insert and the cloning method.

The polymerase is a decision point because the error rate of the polymerase affects the quality of the PCR product. The error rate is the number of errors per base. The error rate is a property of the polymerase.

The polymerase is a decision point because the processivity of the polymerase affects the length of the PCR product. The processivity is the number of nucleotides that the polymerase can incorporate. The processivity is a property of the polymerase.

The polymerase is a decision point because the extension rate of the polymerase affects the time of the PCR. The extension rate is the speed of the polymerase. The extension rate is a property of the polymerase.

The Polymerase as a Tool for the Cloning

The polymerase is a tool for the cloning. The polymerase is used to amplify the insert. The polymerase is used to produce the PCR product.

The polymerase is a tool for the cloning because the polymerase is used to amplify the insert. The polymerase is used to produce the PCR product. The PCR product is used for the cloning.

The Limitations of the Proofreading Polymerase

The Limitations of the Proofreading Polymerase in the PCR

The proofreading polymerase has limitations in the PCR. The proofreading polymerase has a lower extension rate than the non-proofreading polymerase. The proofreading polymerase has a lower processivity than the non-proofreading polymerase.

The proofreading polymerase has a lower extension rate because the proofreading step takes time. The proofreading step is the removal of the incorrect nucleotide. The proofreading step is a time-consuming step.

The proofreading polymerase has a lower processivity because the proofreading step is a time-consuming step. The proofreading step is the removal of the incorrect nucleotide. The proofreading step is a time-consuming step.

The Limitations of the Proofreading Polymerase in the Cloning

The proofreading polymerase has limitations in the cloning. The proofreading polymerase has a lower extension rate than the non-proofreading polymerase. The proofreading polymerase has a lower processivity than the non-proofreading polymerase.

The proofreading polymerase has a lower extension rate because the extension step is a time-consuming step. The extension step is the time of the extension. The extension step is a time-consuming step.

The proofreading polymerase has a lower processivity because the processivity is a time-consuming step. The processivity is the time of the processivity. The processivity is a time-consuming step.

The Role of the Polymerase in the Cloning Workflow

The Polymerase as a Decision Point in the Cloning

The polymerase is a decision point in the cloning workflow. The choice of the polymerase affects the quality of the PCR product. The choice of the polymerase affects the quality of the cloning.

The polymerase is a decision point because the error rate of the polymerase affects the quality of the PCR product. The error rate is the quality of the PCR product. The error rate is a property of the polymerase.

The polymerase is a decision point because the processivity of the polymerase affects the length of the PCR product. The processivity is the length of the PCR product. The processivity is a property of the polymerase.

The polymerase is a decision point because the extension rate of the polymerase affects the time of the PCR. The extension rate is the time of the PCR. The extension rate is a property of the polymerase.

The Polymerase as a Tool for the Cloning

The polymerase is a tool for the cloning. The polymerase is used to amplify the insert. The polymerase is used to produce the PCR product.

The polymerase is a tool for the cloning because the polymerase is used to amplify the insert. The polymerase is used to produce the PCR product. The PCR product is used for the cloning.

Frequently Asked Questions

What is the difference between a proofreading and a non-proofreading polymerase?

A proofreading polymerase has a 3' to 5' exonuclease domain that can remove an incorrectly incorporated nucleotide. A non-proofreading polymerase lacks this domain and cannot edit the template. The proofreading polymerase has a lower error rate, but it also has a lower extension rate.

How do I choose a polymerase for my cloning?

The choice of polymerase depends on the insert length, the template complexity, and the cloning method. A proofreading polymerase is the appropriate choice for a gene that will be expressed. A non-proofreading polymerase is the appropriate choice for a simple screening.

What is the error rate of a proofreading polymerase?

The error rate of a proofreading polymerase is a property of the enzyme. The error rate is measured under specific conditions. The error rate is a starting point for the selection of the polymerase.

How do I measure the error rate of a polymerase?

The error rate can be measured by sequencing a number of clones from a single PCR product. The number of mutations divided by the total number of bases sequenced gives an estimate of the error rate. The error rate is affected by the number of clones and the length of the insert.

What is the role of the buffer in the PCR?

The buffer is a component of the PCR. The buffer is optimized for the polymerase. The buffer is a component of the PCR. The buffer is a component of the PCR.

What is the role of the controls in the PCR?

The controls are used to verify the performance of the reaction. The controls include the positive control, the negative control, and the no-template control. The controls are an important part of the PCR.

What is the role of the sequence verification in the cloning?

The sequence verification is the final step in the cloning. The sequence of the clone is compared to the expected sequence. The sequence verification is important for the cloning of the expression.

What is the role of the biosafety in the cloning?

The biosafety is an important part of the cloning. The biosafety is based on the risk assessment. The risk assessment is based on the properties of the vector, the insert, and the host.

Using the Evidence

Source	Best use in this topic	Important limitation
Molecular Biology and Laboratory Methods	official guidance	Check the linked page for current local requirements
Biosafety in Microbiological and Biomedical Laboratories	official guidance	Check the linked page for current local requirements
NIH Guidelines for Recombinant or Synthetic Nucleic Acid Molecules	official guidance	Check the linked page for current local requirements

Related Molecular Biology Guides

References and Further Reading

Molecular Biology and Laboratory Methods. National Library of Medicine.
Biosafety in Microbiological and Biomedical Laboratories. CDC and NIH.
NIH Guidelines for Recombinant or Synthetic Nucleic Acid Molecules. National Institutes of Health.
Addgene Protocols. Addgene.
MIQE Guidelines. Clinical Chemistry.
NIST Laboratory Programs. National Institute of Standards and Technology.
Mitochondrial DNA mutations, oxidative stress, and apoptosis in mammalian aging.. Science (New York, N.Y.), 2005.
Thermostable Bst DNA polymerase I lacks a 3'-->5' proofreading exonuclease activity.. Genetic analysis : biomolecular engineering, 1996.
In-fusion® cloning with vaccinia virus DNA polymerase.. Methods in molecular biology (Clifton, N.J.), 2012.
DNA polymerase delta Exo domain stabilizes mononucleotide microsatellites in human cells.. DNA repair, 2021.
Precise and Accurate DNA-3'/5-Ends Polishing with Thermus thermophilus Phage vb_Tt72 DNA Polymerase.. International journal of molecular sciences, 2024.

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