Fos expression in the VLPO is developmentally organized. A, Photomicrographs of Fos-ir in females, males, and masculinized females in the VLPO. B, Males and masculinized females have 58% and 46% less Fos-ir cells, respectively, compared with females. *, P < .05 vs male and masculinized female. Data are represented as mean ± SEM.