Basal IEG protein expression in the binocular zone of the visual cortex in WT and egr1 KO mice, respectively. A, B, Nissl staining; C, D, Egr1 immunoreactivity; E, F, Egr2 immunoreactivity;G, H, Egr3 immunoreactivity in coronal sections. Scale bars: A, 1 mm; B–H, 500 μm.