• My NEB
  • Print
  • PDF
  • Interactive Tools

    Try the Double Digest Finder

    NEB Tools

    Enzyme Finder
    Enzyme Finder
    Use this tool to select restriction enzymes by name, sequence, overhang or type. Enter your sequence using single letter code nomenclature, and Enzyme Finder will identify the right enzyme for the job.
    DNA Sequences and Maps Tool
    Use this tool to find the nucleotide sequence files for commonly used molecular biology tools, including plasmid, viral and bacteriophage vectors.
    Double Digest Finder
    Double Digest Finder
    Use this tool to guide your reaction buffer selection when setting up double-digests, a common timesaving procedure. Choosing the right buffers will help you to avoid star activity and loss of product.
    PCR Selector
    PCR Selection Tool
    Use this tool to help select the right DNA polymerase for your PCR setup. Whether your amplicon is long, complex, GC-rich or present in a single copy, the PCR selection tool will identify the perfect DNA polymerase for your reaction.
    Tm Calculator
    Tm Calculator
    Use this tool when designing PCR reaction protocols to help determine the optimal annealing temperature for your amplicon. Simply input your DNA polymerase, primer concentration and your primer sequence and the Tm Calculator will guide you to successful reaction conditions.
    Enzyme Finder
    Enzyme Finder
    Use this tool to select restriction enzymes by name, sequence, overhang or type. Enter your sequence using single letter code nomenclature, and Enzyme Finder will identify the right enzyme for the job. Enzymes available from NEB are displayed first.

    Additional Links

    REBASE
    REBASE
    Use this tool as a guide to the ever-changing landscape of restriction enzymes. REBASE, the Restriction Enzyme DataBASE, is a dynamic, curated database of restriction enzymes and related proteins.
    NEB Cutter®
    NEBcutter® V2.0
    Use this tool to identify the restriction sites within your DNA sequence. Choose between Type II and commercially available Type III restriction enzymes to digest your DNA. NEBcutter® V2.0 will indicate cut frequency and methylation state sensitivity.
    PolBase
    Polbase
    Polbase is a repository of biochemical, genetic, and structural information about DNA Polymerases.
    NEBuilder
    NEBuilder®
    NEBuilder® can be used to design primers for your Gibson Assembly reaction, based on the entered fragment sequences and the polymerase being used for amplification.
    InBase
    InBase
    Inteins are in-frame sequences that disrupt the coding region of a host gene. Unlike introns, inteins are excised post-translationally from a protein precursor by a self-catalytic protein splicing mechanism. InBase describes how inteins work and is home to the "Intein Registry" that includes a list of inteins and their properties, such as prototype intein, domain of life, endonuclease activity or motifs, locations of exteins, insertion site comments, discoverers (with contact information) and references.
    NEBaseChanger
    NEBaseChanger can be used to design primers specific to the mutagenesis experiment you are performing using the Q5® Site-Directed Mutagenesis Kit. This tool will also calculate a recommended custom annealing temperature based on the sequence of the primers by taking into account any mismatches.