= DNA ladder
{c}
A <DNA ladder> contains <DNA> fragments of known lengths in <base pairs>. Its <gel bands> supply size references. Match the sample's strandedness and shape, and use the specified lengths for that <DNA ladder>. A size reference need not provide a quantitative <mass> standard.<Five Main Nucleic Acid Gel Electrophoresis Steps by Thermo Fisher Scientific>[Step 2, Nucleic acid ladder selection guidelines: fragment structure, conformation, intended use and manufacturer-specific composition]{ref}
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