ERBB4 and schizophrenia: Previous studies have pointed out the role of NRG1 and its receptor ErbB4 in the pathophysiology of schizophrenia (Stefansson et al. 2002; Rimer et al. 2005; Dejaegere et al. 2008; Savonenko et al. 2008; Law et al. 2012; Mei and Nave 2014).