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Photomicrographs of parvalbumin-ir staining in the nucleus accumbens (Acb; A), caudate nucleus (Cd; B), putamen (Pu; C), external globus pallidus (EGP; D), and internal globus pallidus (IGP; E) in the tree shrew. Parvalbumin-ir neurons were also present in the Acb (F), caudate putamen (CPu; G), EGP (H), and entopeduncular nucleus (EP; I) of the rat. Scale bar, 100 μm.
