2HZV:
reference: NikR-operator complex structure and the mechanism of repressor activation by metal ions., Schreiter ER, Wang SC, Zamble DB, Drennan CL, Proc Natl Acad Sci U S A. 2006 Sep 12;103(37):13676-81. Epub 2006 Aug 31. PMID: 16945905

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