For example, BD + SCZ subgroup included a d-amino acid oxidase (DAO) and its activator (DAOA), a Wnt pathway enzyme (GSK3β), a mitotic protein (MAD1L1), an ATP binding protein (TRANK1), a cell signaling receptor tyrosine kinase (ERRB4), a regulator of G protein signaling (RGS4), a cholinergic receptor (CHRNA7), and glutamate receptors (GRM3, GRIN1, and GRIA1). This evidence concerns the gene DAO and Behcet disease.