1XCV:
reference: Mechanism of metal ion activation of the diphtheria toxin repressor DtxR., D'Aquino JA, Tetenbaum-Novatt J, White A, Berkovitch F, Ringe D, Proc Natl Acad Sci U S A. 2005 Dec 20;102(51):18408-13. Epub 2005 Dec 13. PMID: 16352732

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).