IL12A and schizophrenia: STRING analysis highlighted first-order protein interactions among IL12RB1 and IL12B, IL1B, IL6, and IL12A, all of which have previously been associated with schizophrenia (Figure 4D) (Ozbey et al., 2008; Shirts et al., 2008; Fatjo-Vilas et al., 2012; Yoshida et al., 2012).