The errant gene that causes a hereditary form of breast cancer was an especially elusive quarry. Scientists knew that the gene -- dubbed BRCA1 -- was somewhere on chromosome 17, but they couldn't pinpoint an exact location or identify the culprit's chemical makeup. Over the past four years, dozens of rival laboratories and hundreds of scientists took up the search, and rumors circled the globe that one group or another had found the damaging strand of DNA. Last week, finally, the rumors were true. An international team led by researchers at the University of Utah and Myriad Genetics, a Salt Lake...
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