Fig. 4

Fos expression in different brain regions of the aged male mice induced by i.p. injection of LiCl. c Representative histology (a) and quantification (b, c) of Fos-like immunoreactivity in the left- and right-side of the aIC, the mIC, the pIC, the CeA, the PVT, the LHA, the PBN, and the ACC after intraperitoneal injection of LiCl (150 mg/kg). n = 6–8 mice per group. Data were presented as means ± SEM. Scale bar, 100 μm