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Molecular weight size marker — A molecular weight size marker is used to identify the approximate size of a molecule run on a gel, using the principle that molecular weight is inversely proportional to migration rate through a gel matrix. Therefore when used in gel… … Wikipedia
Color marker — A Color marker is used to monitor the progress of agarose gel electrophoresis and polyacrylamide gel electrophoresis (PAGE) since DNA, RNA, and most proteins are colourless. They are also referred to as tracking dyes. Commonly used color markers… … Wikipedia

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