FEZ1 and infantile epilepsy syndrome: STXBP1 expression was also highly correlated with FEZ1, but not as tightly as NRXN1. STXBP1 has been associated with schizophrenia (Behan et al., 2009) although with less evidence than NRXN1 but is more commonly associated with infantile epilepsy (Xian et al., 2022).