DRD2 and schizophrenia: The identified genes included Drd2 and Adora2a, as well as several other genes with established strong association with schizophrenia, including activity regulated cytoskeleton associated protein (Arc), BTG2 anti-proliferation factor 2 (Btg2), and inverted formin, FH2 and WH2 domain containing (Inf2) (Fig. 4A and Supplementary Fig. S4C) [74–87].