3SZ6:
reference: Differential function of lip residues in the mechanism and biology of an anthrax hemophore., Ekworomadu MT, Poor CB, Owens CP, Balderas MA, Fabian M, Olson JS, Murphy F, Balkabasi E, Honsa ES, He C, Goulding CW, Maresso AW, PLoS Pathog. 2012 Mar;8(3):e1002559. Epub 2012 Mar 8. PMID: 22412371

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