Figure 3: Proteins specifically expressed in the central nervous system. Four examples of four different proteins expressed in cerebellum, and in addition, an example of ELAVL4 expression in testis. The examples cover known proteins involved in neuro-transmission and neurological development such as GAP43 (A) and SLC1A3 (B) showing strong expression in the neuropili corresponding to the molecular layer of cerebellum. Less well known proteins with enhanced but not exclusive expression in the CNS are ELAVL4 showing strong expression in glial cells mainly in the granular layer of cerebellum and in early spermatogonia in testis (C) and a protein with essentially unknown function, ZNF509 showing a nuclear expression pattern mainly in Purkinje cells (D).