Sister from another mister. Brother from another mother. The family you choose. When it comes to describing your friends, those turns of phrase may be a lot more accurate than you think. Genetics researchers at the University of California, San Diego and Yale University have found that friends can share a lot of the same genes -- the same amount of genes, in fact, as are shared by fourth cousins. "In a lot of genetics research, the assumption is that we are interacting with lots of people who are not related to us, so genes aren't going to matter," said
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