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Density of vasopressin immunoreactive fibers in the lateral septum (means ± SEM). Black andhatched bars represent the results from the first and second experiments, respectively. Within the core cross, males (XY−Sry and XXSry) had a higher density than did females (p < 0.000001). XY−Sry males had a higher density than XXSry males (p< 0.05), showing an effect of sex chromosome complement on this trait.
