NRG1 and schizophrenia: Furthermore, within the patients with schizophrenia significant negative correlations between age of onset and NRG1 EGFα (r = −0.37, Praw = 0.002, PB-H = 0.02) and EGFβ (r = −0.36, Praw = 0.001, PB-H = 0.02) expression were detected (Fig. 2, Supplementary Table S5).