 | male, 3031, 4243
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 | hunting, 52
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 | Neanderthal peoples, 31
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 | verbal skills, 42
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 | Prison inmates. See Criminals.
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 | Prolactin, 168172
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 | low levels and effect on personality, 169171
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 | smiling and, 171172
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 | Prostate cancer, and high levels of testosterone, 100, 160, 166, 189
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 | Proximal explanations, 26
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 | Proxmire, William, 96
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 | Radioimmunoassay (RIA), 67
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 | Rambunctious behavior and testosterone, 8, 8187
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