Positive correlations were observed between the expression levels of DARPP-32 and CaN of controls in PFC (r = 0.585, p = 0.004) (Fig. 3a), patients with schizophrenia in PFC (r = 0.645, p = 0.002) (Fig. 3a) and NAc (r = 0.550, p = 0.010) (Fig. 3c). This evidence concerns the gene PPP1R1B and schizophrenia.