Key term for OCR GCSE History B, used in Britain since c.1900.
A scientific process used to amplify small amounts of DNA, allowing a profile to be created from a tiny sample or 'touch DNA'.
PCR (Polymerase Chain Reaction) appears in OCR GCSE History B revision content for Crime and Punishment (c.1250–Present), especially Britain since c.1900 and Changes in law enforcement.
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