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Among control animals, MePD somata were significantly larger in males (two-tail t test, P = 0.05). Gonadectomy and implantation of a blank Silastic capsule reduced the size of these neurons in males. Implantation of a capsule packed with T increased soma size in females, again eliminating the difference. Two-way ANOVA among the gonadectomized groups revealed a significant main effect of T (F(1, 18) = 21.5; P < 0.0003) but none for sex (P > 0.05) or any significant interaction.
