Figure 8

c-Fos expression in retrieval-positive and -negative sires after stimulation with dam's pheromones. Representative images of c-Fos-positive cells are shown in the mPOA (A), VTA (B), NAcc (C), VP (D), and olfactory bulb (OB, E) regions. The brains were fixed for approximately 30 min from the start of the separation experiments in the dam's conditioned cages and the retrieval test. The data are expressed as the mean ± s.e.m. (n = 6 each); ***P = < 0.0001, Two-tailed, Student's t-test.