4DVE:
reference: Structural divergence of paralogous S components from ECF-type ABC transporters., Berntsson RP, Ter Beek J, Majsnerowska M, Duurkens RH, Puri P, Poolman B, Slotboom DJ, Proc Natl Acad Sci U S A. 2012 Aug 13. PMID: 22891302

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