VPP1 protein levels did not show a significant decrease in the schizophrenia group compared to the control group [t = 0.1384, df = 24, p = 0.4455; Median ± SEM: C = 0.844 ± 0.148, SZ = 0.884 ± 0.249] (Fig 2A, 2B and 2C). The gene discussed is ATP6V0A1; the disease is schizophrenia.