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. 2000 Dec;64(4):672–693. doi: 10.1128/mmbr.64.4.672-693.2000

FIG. 2.

FIG. 2

Schematic representation of the two major classes of multidrug transporters. (A) ABC-type multidrug transporters utilize the free energy of ATP hydrolysis to pump drugs out of the cell. (B) Secondary multidrug transporters mediate the extrusion of structurally unrelated drugs in a coupled exchange with protons or sodium ions.