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STR profiling and crime

There may only be a few drops of blood or a single hair left at the scene of a crime, but this is enough to get a DNA STR profile. Forensic scientists can compare the STR profile of a blood sample with those of a suspect or the victim, to look for an exact match. But there is a tiny possibility you may share your STR profile with someone else, so although the technique can prove innocence, it cannot necessarily prove guilt.

Analysing a DNA STR profile.
Analysing a DNA STR profile.
Cellmark Diagnostics, Abingdon

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