FABP7 and schizophrenia: Other sex-dependent associations between genes and schizophrenia include Fabp7, which is associated with NMDA receptors in mice [27]; in humans, DLG1, which codes for a synapse-associated protein, has a male-specific association with schizophrenia [61], and Ptpn5, tyrosine-protein phosphatase non-receptor type 5, is important in excitatory postsynaptic activity [62].