DRD2 and schizophrenia: For instance, MacLeod et al. [56] reported candidate genes (i.e., NCOA7, GAD2, PDGFD, TMPRSS5, DRD2, IQSEC1, MAOB, PTPRF, SLC25A16, TMCO5A, and SNRPB2) associated with dairy cattle temperament that were previously linked to human neuropsychiatric disorders (e.g., schizophrenia).