55.1 MB (3.8 MB compressed)
3559 x 5407 pixels
30.2 x 45.7 cm ⏐ 11.9 x 18.0 in (300dpi)
PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY
DNA fingerprinting. A laboratory technician making a visual check of a DNA autoradiograph (autorads). Autorads 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 Lifecodes Corp., a commercial laboratory in New York State, USA.
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