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Mb = million bases (or base pairs). The length of a strand of DNA is often denoted by the number of bases, which is equal to the number of nucleotides. So 2.4 kb means 2,400 bases, and 3.7 Mb means 3.7 million bases.

For a double-stranded molecule of DNA, the letters "bp" are often used, meaning "base pairs".

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16y ago

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