COLIN CUTHBERT / SCIENCE PHOTO LIBRARY COLIN CUTHBERT / SCIENCE PHOTO LIBRARY
DNA research. Technician pipetting samples of deoxyribonucleic acid (DNA) that will be run through a polymerase chain reaction (PCR) machine (centre left). PCR is a technique by which small amounts of DNA are amplified using a bacterial DNA-copying enzyme. The PCR machine repeatedly heats samples to temperatures at which the amplification reactions can proceed.
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