"When came back with the initial results, I was blown away," lead author Martin Cohn, a developmental biologist at the University of Florida, said at the time."We looked at each other's hands, then got busy planning the next experiment." The study was done in mice, and does not suggest anything about sexuality, but the researchers found it an exciting starting point. When they added testosterone they got super male ratios, and when they added estrogen, super female ratios. When the researchers blocked testosterone receptors in mouse embryos, they got a female digit ratio. A study from 2011, published in the journal Proceedings of the National Academy of Sciences, found that sex hormones present in early embryonic development determine the length of fingers. Previous research has shown how sex hormones can affect how a baby grows in the womb. Because of the link between hormone levels and difference in finger lengths, looking at someone's hands could provide a clue to their sexuality." "Research suggests that our sexuality is determined in the womb and is dependent on the amount of male hormone we are exposed to or the way our individual bodies react to that hormone, with those exposed to higher levels of testosterone being more likely to be bisexual or homosexual. "Because identical twins, who share 100% of their genes, can differ in their sexual orientations, factors other than genetics must account for the differences," said Tuesday Watts, from the department of psychology. The gay male twin on average had more male-typical hands than the straight brother, but the difference was not significant. Results showed the lesbian twin would have more male-typical hands than the straight sister. Account icon An icon in the shape of a person's head and shoulders.
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