Chunk #6 — 47,XXY

Source: Effects of sex chromosome aneuploidies on brain development: evidence from neuroimaging studies.
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A separate analysis of amygdala and hippocampal volumes obtained by manual tracing in these same MRIs [Patwardhan et al., 2002] found that the volume of the amygdala was significantly decreased in XXY males, but hippocampal volumes were preserved. Effects of testosterone exposure were not reported in this analysis.