Embryologist Rick Slifkin displays some of the frozen sperm stored at Reproductive Medicine Associates of New York, in New York, Thursday, Oct. 3, 2013. Fertility clinics have put a new twist on how to make babies: A "two-mom" approach that lets female same-sex couples share the biological role. One woman's eggs are mixed in a lab dish with donor sperm, then implanted in the other woman who carries the pregnancy. (AP Photo/Richard Drew)

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