To test whether this antibody detects DRD2-specific bands in breast cancer cell lines we knocked down DRD2 in a thioridazine-sensitive cell line (SUM229-EpCAM+) and a thioridazine insensitive cell line that expresses DRD2 mRNA (SUM159), and ran western blots using this anti-DRD2 antibody. The gene discussed is EPCAM; the disease is breast cancer.