Scientist works in a darkroom; preparing to photograph an agarose electrophoresis gel used in mapping DNA extracted from chromosomes of the bacteria Escherichia 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. Dr Jonathan Beckwith's laboratory at Harvard, USA, May 1989.
- ©Peter Menzel, www.menzelphoto.com
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