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Thank you for signing up. Sorry, it looks like an error occurred. The amount we don't know about the difference between twins can be staggering, write Phillip and Douglas Griffiths.

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Identical twins who were born girls have become brothers after they both came out as transgender and transitioned to male. Jack and Jace Grafe, 23, were born Jaclyn and Jennifer in June and raised in a conservative Christian home in Baltimore, Maryland, however, they never felt truly comfortable. As children, the twins cried themselves to sleep and prayed that they would wake up as boys - despite not understanding what it meant to be transgender.

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Identical twins spend their lives being compared. They share duplicate DNA although it's expressed in different genesas well as the same upbringing so they're generally similar individuals, notwithstanding the effort they put into being unique. And this is why I find two of my friends so interesting.

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A new study of twins provides the strongest evidence yet that homosexuality has a genetic basis, researchers say, though they say other factors like social conditioning may be important. The study, published in the December issue of The Archives of General Psychiatry, adds to evidence that sexual orientation does not result from a maladjustment or moral defect, one author said. Michael Bailey, an assistant professor of psychology at Northwestern University in Evanston, "which is exactly the kind of pattern you would want to see if something genetic were going on.

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The relationship between biology and sexual orientation is a subject of research. While scientists do not know what determines an individual's sexual orientationthey theorize that it is caused by a complex interplay of genetichormonaland environmental influences. Biological theories for explaining the causes of sexual orientation are favored by scientists.

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Aiden and Ethan Dvash-Banks are twin brothers who were born minutes apart. But only one of them was considered to be a United States citizen by the State Department. A federal judge ruled this week that was a mistake.

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A same-sex couple are parents to twin boys who are also biological half brothers. The babies were carried by Andy's cousin, who served as a surrogate, and were born at the same time on 16 Junemaking them twins. However they are also half brothers as their embryos were created using eggs from the same donor but sperm from each father.

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A genetic analysis of pairs of gay brothers, including sets of twins, has provided the strongest evidence yet that gay people are born gay. The study clearly links sexual orientation in men with two regions of the human genome that have been implicated before, one on the X chromosome and one on chromosome 8. The finding is an important contribution to mounting evidence that being gay is biologically determined rather than a lifestyle choice.

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A center, Collins played college basketball for Stanford Universitywhere he was an All-American in — After the —13 NBA season concluded, Collins publicly came out as gay. He became a free agent and did not play again until Februarywhen he signed with the Nets and became the first openly gay athlete to play in any of four major North American pro sports leagues.

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But experts say the origins of partner preference remain a mystery. For men, new research suggests that clues to sexual orientation may lie not just in the genes, but in the spaces between the DNA, where molecular marks instruct genes when to turn on and off and how strongly to express themselves. That news, presented at the meeting of the American Society of Human Genetics on Thursday, may leave the genetically uninitiated scratching their heads. Through the epigenome, the results suggest, some facet of life experience likely also primes a man for same-sex attraction.

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