2PFY:
reference: Crystal Structures of two Bordetella pertussis Periplasmic Receptors Contribute to Defining a Novel Pyroglutamic Acid Binding DctP Subfamily., Rucktooa P, Antoine R, Herrou J, Huvent I, Locht C, Jacob-Dubuisson F, Villeret V, Bompard C, J Mol Biol. 2007 Jun 29;370(1):93-106. Epub 2007 Apr 25. PMID: 17499270

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