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Structure and mechanism of the ABC transport system. (A) Proposed mechanism for translocation of heme by ShuUV. (B) Sodium dodecyl sulfate–polyacrylamide electrophoresis of the proteoliposomes with ShuT in the lumen. (C) Schematic of the proteoliposome system indicating the orientation of transport from ShuT in the lumen to ShuS in the external medium.
