Staring at the walls of doctors' offices while awaiting their turn, 21st century Americans may see a colorful chart hanging next to the traditional diplomas and the renderings of skeletal parts and organs. It will depict the 23 pairs of human chromosomes and pinpoint on each one the location of genes that can predispose people to serious disease.
By then, scientists involved in the $3 billion Human Genome Project will have isolated and identified most or all of the more than 100,000 genes crammed into the human genome, the strand of DNA in the nucleus of each of the body's 100...
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