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Stereoview of inward-facing model [12] viewed from external membrane surface, showing I34 (TMH 1) in yellow and V240 (TMH 7) in brown, and the basic residues R260 (TMH 8) in light blue and K357 (TMH 11) in dark blue. I34 and V240 were substituted by C in cysteine-less LmrP (referred to LmrP-cl), yielding the double cysteine mutant I34C V240C LmrP-cl (referred to as LmrP-dc).
