PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY
Scientist works in a darkroom, preparing to photograph an agarose electrophoresis gel used in "mapping" DNA extracted from chromosomes of the bacteria Escherischia coli. DNA mapping refers to a physical survey of each of an organism's chromosomes in an attempt to locate genes or other landmarks. Mapping and sequencing (decoding the DNA base-pair sequences of chromosomes) are the two phases of the human genome project, an ambitious plan to reveal all of the information encoded in the 23 pairs of human chromosomes. Photographed in Dr Jonathan Beckwith's laboratory at Harvard, USA, in May 1989.
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