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Workers at Cellmark checking DNA autoradiographs

Workers at Cellmark checking DNA autoradiographs

H200/0025

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Credit

PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY

Caption

Forensic science laboratory using DNA fingerprinting. Overhead view of laboratory technicians checking DNA autoradiographs (autorads). These are produced by labelling the DNA fragments in an electrophoresis gel with a radioactive marker chemical. The gel is then placed on an piece of X-ray film, the radiation from the marker leaves a dark patch, representing each fragment, on the film after development. Comparison of autorads from two samples of DNA is the method by which a correlation may be made - so-called DNA fingerprinting. Photographed at Cellmark Diagnostics, a commercial laboratory at Oxford, England.

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