1V15:
reference: Structure-based analysis of the metal-dependent mechanism of H-N-H endonucleases., Mate MJ, Kleanthous C, J Biol Chem. 2004 Aug 13;279(33):34763-9. Epub 2004 Jun 8. PMID: 15190054

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