2F5X:
reference: Crystal Structure of Bordetella pertussis BugD Solute Receptor Unveils the Basis of Ligand Binding in a New Family of Periplasmic Binding Proteins., Huvent I, Belrhali H, Antoine R, Bompard C, Locht C, Jacob-Dubuisson F, Villeret V, J Mol Biol. 2005 Dec 21;. PMID: 16403514

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