PPP2R1A and schizophrenia: Of the 102 proteins that were differentially expressed, 17 were ribosomal proteins that were significantly decreased, and several ribosomal/eIF2 signaling proteins (RPL14, RPL13A, RPL18A, PPP2R1A and FNRB) were robust discriminators between the control and schizophrenia groups (Figure 1).