1RVA:
reference: Mg2+ binding to the active site of EcoRV endonuclease: a crystallographic study of complexes with substrate and product DNA at 2 A resolution., Kostrewa D, Winkler FK, Biochemistry 1995 Jan 17;34(2):683-96. PMID: 7819264

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