GPR17 and schizophrenia: About half of them has been previously associated with schizophrenia in humans, such as Olig1 [82, 83], Fgfr1 [84–86], Gpr17 [87, 88], Gna12 [87], Abca2 [89], Sox1 [90], Dpm2 [91], and, as a locus for de novo mutations, Rab2a [92].