Research on the human genome: composite image of an infant and a computer graphics model of the DNA molecule overlaid on a computer enhanced DNA sequencing autoradiogram. DNA sequencing of chromosomes involves decoding the base pair sequence of sections of DNA - most usefully, those sections called genes which encode specific proteins. Sequencing and mapping - surveying each of the 23 pairs of human chromosomes to locate genes or other important markers - are two phases in the human genome project. The construction of such a complete genetic map involves a detailed biochemical survey of every gene expressed on all 23 pairs of human chromosomes. (1989).
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