Expression patterns of inhibitory neuronal markers in the MePD and MePV. (A-H) Permanent immunohistochemistry in P22 wild-type brains (n = 3) showing the expression of classic inhibitory neuronal markers in the MePD (A,C,E,G) and MePV (B,D,F,H) of the posterior MeA. Calbindin (A,B, arrows), neuronal nitric oxide synthase (nNOS) (C,D, arrows), FoxP2 (E,F, arrows) and Somatostatin (G,H, arrows) expression was observed in both nuclear subdivisions of the posterior MeA. (a'-h') High-power views of boxed regions in corresponding panels. Abbreviations: I, intercalated nuclei of the amygdala, opt, optic tract; slME, superficial layer of the medial nucleus. Scale bar: 200 μm.