In 1996, scientists solved a mystery surrounding certain gay men who were immune to AIDS. This year, Pfizer Inc. will sell the first drug based on that discovery. The U.S. and European researchers, writing in several science journals, said a small group of Caucasian gay men carry a gene mutation that provides natural protection against HIV, the virus that causes AIDS. This week, culminating an 11-year race among three drugmakers, Pfizer released successful studies of a new pill specifically designed to mimic the gene defect.
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