4IQC:
reference: Crystal structure and conformational flexibility of the unligated FK506-binding protein FKBP12.6., Chen H, Mustafi SM, LeMaster DM, Li Z, Heroux A, Li H, Hernandez G, Acta Crystallogr D Biol Crystallogr. 2014 Mar;70(Pt 3):636-46. doi:, 10.1107/S1399004713032112. Epub 2014 Feb 15. PMID: 24598733

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