Setting up a polymerase chain reaction (PCR), Institute of Child Health, London, May 2000.

Setting up a polymerase chain reaction (PCR), Institute of Child Health, London, May 2000.
3 4 c m
40cm
actual image size: 32cm x 26cm

Description

Some of the DNA in bones and teeth can last for many years after a person has died. Scientists can examine DNA from people murdered a century ago, or even from 3000-year-old ancient Egyptian mummies by using a PCR. PCR makes millions of exact copies of a piece of DNA in just under an hour or so, thus allowing scientists to extract DNA from tiny samples that would be too small for other methods.

© Science Museum / Science & Society Picture Library

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