Pinning Down The Gender Bender

Ever since Adam and Eve came together in the Garden of Eden, humankind has pondered the mystery of the sexes. Now, science seems finally to have found la difference--a stretch of DNA with the decidedly unromantic name of Sry, for sex-determining region of the Y chromosome. During the past several years, researchers came to suspect that this piece of DNA was the fabled "male" gene, or testes-determining factor, which triggers a cascade of changes that adds male parts to the basically female mammalian body plan. And now, British government scientists may have proof that the gene behaves as advertised.

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