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DNA tags differ in gay, straight men: epigenetic changes may reflect sexual preference, study finds.
A molecular test claims to distinguish homosexual from heterosexual men.
Chemical modifications to DNA known as epigenetic tags, which change gene activity without altering the gene itself, differ between gay and straight men, researchers from UCLA reported October 8. Patterns in one type of these changes, called DNA methylation, in pairs of twins in which one brother is gay and the other straight distinguish one group from the other about 67 percent of the time, computational...
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