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A tweet from Matthew Gertz ( @MattGertz ) stating: "I learned about Klinefelter Syndrome (XXY) and Turner Syndrome (XO) in biology class my freshman year of high school." Below this, there is a reply tweet from Nancy Mace ( @NancyMace ) saying: "You either have XX or XY chromosomes. Those are the options..." Both tweets include profile pictures of the users.