There has been no systematic investigation of reduced Dlg2 gene dosage on potentially core endophenotypes associated with SZ, ASD, BD, and other neuropsychiatric disorders including motor function, pre‐pulse inhibition (PPI) of startle responses and habituation to a novel stimulus.44, 45, 46, 47, 48, 49, 50, 51, 52, 53. This evidence concerns the gene DLG2 and Behcet disease.