2ZP2:
reference: Histidine kinase regulation by a cyclophilin-like inhibitor., Jacques DA, Langley DB, Jeffries CM, Cunningham KA, Burkholder WF, Guss JM, Trewhella J, J Mol Biol. 2008 Dec 12;384(2):422-35. Epub 2008 Sep 16. PMID: 18823995

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