Dopamine D3 receptor expression (DRD3) was detected in CD4+ T-cells and was found to be significantly increased in the clozapine-treated schizophrenia group (t = -2.2, df = 30, P = 0.035), but there was no significant difference in DRD4 expression; Fig 3. The gene discussed is DRD3; the disease is schizophrenia.