FINDING A SINGLE GENE AMONG THE ESTIMATED 100,000 genes scattered along the 23 pairs of chromosomes in human cells is every bit as daunting as finding the proverbial needle in a haystack. But now the quest has been made simpler, at least for two of those chromosomes. As reported in the research journal Nature, investigators in Paris have published the first map to describe in the correct order all the most important subsections of the 21st chromosome -- the one that harbors genes associated with Down syndrome, Alzheimer's disease and other neurological disorders. Simultaneously, researchers in Boston published a similar map,...
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