RGS4 and schizophrenia: Our case control sample has failed to detect association at the CAPON and RGS4 loci and has implicated the EPSIN4 gene on 5q33, the UHMK1 gene on 1q22.3, the PCM1 gene on 8p22 and the FXYD6 gene on 11q22 with schizophrenia [40,43-47].