sentence: Alamar blue ( Cell Titer Blue ) was purchased from Promega ( Madison , WI ) ; tamoxifen from MP Biomedicals ( Solon , OH ) ; dimethyl sulfoxide ( DMSO ) , aphidicolin from Sigma-Aldrich ( St. Louis , MO ) ; phenyltoloxamine , clotrimazole , sangivamycin and amphotericin B from VWR ( West Chester , PA ) ; disulfiram from Fisher Scientific ( Pittsburgh , PA ) ; pentamidine from Toronto Research Chemicals ( Ontario , Canada ) and ; acivicin from Biomol ( Plymouth Meeting , PA ) .