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of organisms.

If one targets area that is known to either match with a fixed size or not match in the overwhelming majority of cases, then the band either exists or doesn't. In this case, many pairs of primers that matches areas of different lengths can be used together (if they do not end up matching extra areas), allowing the presence or absence of them to be analyzed in a single PCR reaction. This is PCR fingerprinting.

STR analysis

A kind of human genetic variation that is easy to spot as size difference are

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