TAC1 and psychotic disorder: We have also confirmed that expression of the neuropeptide genes are down-regulated in psychosis; NPY (p = 0.02, FC -1.32), NR4A2 (p = 0.01, FC -1.39), SST (p = 0.001, FC -1.57) and TAC1 (p = 0.01, FC -1.6).