2JVN:
reference: Domain C of Human Poly(ADP-ribose) Polymerase-1 Is Important for Enzyme Activity and Contains a Novel Zinc-Ribbon Motif(,)., Tao Z, Gao P, Hoffman DW, Liu HW, Biochemistry. 2008 May 2;. PMID: 18452307

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