Comparison of prolactin-induced pSTAT5 in the female rat forebrain in response to systemic and icv prolactin delivery. Representative images show pSTAT5 immunohistochemistry at the level of the organum vasculosum of the lamina terminalis (A,A′), rostral periventricular nucleus of the third ventricle (B,B′), medial amygdala (C,C′), paraventricular nucleus (D,D′), arcuate nucleus (E,E′), and supraoptic nucleus (F,F′) 120 minutes following systemic (A–F) prolactin delivery (1 mg/kg b.w.) and 30 minutes following icv (A′–F′) prolactin delivery (5 μg). Scale bars = 100 μm.