(a) In situ hybridization and (b) expression views displaying expression levels (red - high, yellow - medium, green - low) for AK019375, which is broadly but preferentially expressed in the olfactory bulb, hippocampus, and cerebellar cortex. (c) In situ hybridization and (d) expression views for AK017599, which is enriched in multiple layers of the cerebral cortex. (e) In situ hybridization and (f) expression views for AK157548, which is enriched in hippocampal CA1-3 subregions and the dentate gyrus (DG). (g) In situ hybridization and (h) expression views for AK050124, which is enriched in the granule cell and Purkinje cell layers of the cerebellum (Images courtesy of the Allen Brain Atlas - Allen Institute for Brain Science, Seattle).