The genes encoding NRG1, ErbB3, and ErbB4 have been identified as susceptibility genes for schizophrenia (Corfas et al., 2004; Benzel et al., 2007; Law et al., 2007; Walsh et al., 2008; Shi et al., 2009; Buonanno, 2010), and a disruption in the ErbB4 gene has been described in schizophrenic patients (Walsh et al., 2008). Here, NRG1 is linked to schizophrenia.