3DDR:
reference: Heme uptake across the outer membrane as revealed by crystal structures of the receptor-hemophore complex., Krieg S, Huche F, Diederichs K, Izadi-Pruneyre N, Lecroisey A, Wandersman C, Delepelaire P, Welte W, Proc Natl Acad Sci U S A. 2009 Jan 27;106(4):1045-50. Epub 2009 Jan 14. PMID: 19144921

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