4FIL:
reference: Crystal and solution structure analysis of FhuD2 from Staphylococcus aureus in multiple unliganded conformations and bound to ferrioxamine-B., Podkowa KJ, Briere LA, Heinrichs DE, Shilton BH, Biochemistry. 2014 Apr 1;53(12):2017-31. doi: 10.1021/bi401349d. Epub 2014 Mar, 19. PMID: 24606332

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