Distinct distributions of Avpr1a at two levels within the mouse brain. Receptor autoradiography was performed as described (Young et al., 2000) using an 125I-labeled ligand. Abbreviations: CG, central grey; CP, caudate-putamen; Ctx, neocortex; H, hippocampal formation; LS, lateral septum; MS, medial septum; Sum, supramammillary nuclei; VP, ventral pallidum; VTA, ventral tegmental area.