Cerebellar Purkinje cell architecture and GKAP expression appear normal in PSD-93 knock-out mice. The Purkinje cells of PSD-93 knock-out mice display normal dendritic arborizations and somatodendritic localizations for GMP-dependent protein kinase type I (cGKI) and GKAP. Cerebella from wild-type (WT) and PSD-93 knock-out mice (KO) were stained using antibodies to cGKI and GKAP. Magnification, 40×.