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a Mean (± SEM) number of Fos immunoreactive (ir) neurons in the rostral paraventricular nucleus of the hypothalamus (PVN) for PND2, PND9, and PND21 pups that were Isolated (light blue), Reunited (dark blue), or Together (gray) for 1.5 h. *Indicates p ≤ 0.05. b Mean (± SEM) number of Fos immunoreactive (ir) neurons in the caudal PVN for PND2, PND9, and PND21 pups that were isolated, reunited, or together for 1.5 h
