The witness told the court that several samples taken using sticky tape to pick up skin cells showed a mixture of DNA from two or three individuals.

BBC: Lynda Spence

Coley's technology takes aim at toll-like receptors (TLRs), detectors on immune system cells that pick up invaders and bad actors in the body.

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And the pattern is inconsistent - pick a bunch of neighbouring cells and they could each have different chromosome counts.

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