ERBB4 and schizophrenia: Interestingly, kalirin-7, NRG1, and ErbB4 are highly and specifically expressed in GABAergic interneurons, and have been associated with schizophrenia (Ma et al., 2001, 2005; Hill et al., 2006; Li et al., 2006; Fazzari et al., 2010; Del Pino et al., 2013; Kasnauskiene et al., 2013).