The implication of the sex-specific part of the Y-chromosome (YS-SP) on brain serotonin (5-HT) level was investigated using congenic strains for this chromosomal region. The 5-HT level, which was higher in the NZB than in the CBA/H strain of mice, was depleted by the transfer of the YS-SP from NZB on CBA/H whereas the transfer of the YS-SP from CBA/H on NZB had no effect. The variations of 5-HT levels were not correlated with plasma testosterone concentration which is also dependent of the YS-SP.
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Tordjman et al. (1995) studied this question.
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