Table 1. Detection of the expression levels of three major types of MDR proteins in cultured cell lines using immunostaining with monoclonal antibodies and a flow cytometry assay.

	Pgp Staining [C219]	MRP1 Staining [QCRL1]	BCRP/ABCG2 Staining[MM0047-2J39]
CHO K1	0.29±0.3	0.59±0.2	0.74±0.3
A549	0.12±0.02	0.63±0.3	0.57±0.2
HeLa	0.06±0.01	0.10±0.03	0.14±0.01
HL-60	0.13±0.07	0.22±0.07	0.17±0.09
HL-60/MX1	0.11±0.05	0.31±0.04	0.83±0.01
HCT-15	0.28±0.2	0.60±0.13	0.07±0.02
HepG2	0.18±0.05	0.58±0.06	0.14±0.001

Average D values (± SEM) for three representative experiments are presented.