Species differences in the density of OT-ir cells in brain areas.

<p>(A) Species differences in the density of OT-ir cells in the anterior hypothalamus (AH), lateral hypothalamus (LH) and medial preoptic area (MPOA). (B) The two species also differed in the density of OT-ir cells in the subnuclei of the MPOA, including the anterior (MPOAa), intermediate (MPOAi) and posterior (MPOAp) part of the MPOA. (C) Species difference in the density of OT-ir cells in the paraventricular nucleus of the hypothalamus (PVN). ** <i>p</i><0.01.