although increased expression of all three mdr genes was detected in 2 of 12 cell lines tested , multidrug resistance was associated in 10 of 12 lines with the independent overexpression of either mdr1 ( 7 of 12 ) or mdr3 ( 3 of 12 ) but not mdr2 .
C0242640
multidrug resistance
C1412071
mdr2