 | Tribalism, 196199
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 | Truk Island men, 200
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 | Tuberville, G., 65
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 | Turner syndrome, 53
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 | Twins
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 | cows, freemartin calf, 13
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 | girl-boy co-twins and testosterone levels, 13
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 | Udry, Richard, 116
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 | Unemployment, testosterone levels and, 93, 142
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 | Vanity, 6667
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 | Vann, John Paul, 132134
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 | Vasopressin, 98
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 | Vegetarians, and testosterone levels, 18
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