cGK is expressed in the murine hippocampus.Left, Immunoblots of tissue extracts from the hippocampus (Hi), whole brain (Br), lung (Lu), and whole duodenum (Du) with cGKI- (top) and cGKII (bottom)-specific antibodies. Right, In situ hybridization in hippocampal slices with antisense riboprobes specific for cGKI (top) and cGKII (bottom).