An individual's STR may vary from the same STR of another individual by

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STRs, or short tandem repeats, are regions where a specific sequence of DNA is repeated. The number of times this sequence is repeated can vary between individuals, leading to differences in their STR profiles. The other choices (A, B, C, and E) are factors that may contribute to genetic differences between individuals, but they are not specific to the variation in STRs.

An Individual's STR May Vary from the Same STR of Another