4BRK:
reference: Crystallographic Snapshots along the Reaction Pathway of Nucleoside Triphosphate Diphosphohydrolases., Zebisch M, Krauss M, Schafer P, Lauble P, Strater N, Structure. 2013 Jul 2. pii: S0969-2126(13)00200-1. doi:, 10.1016/j.str.2013.05.016. PMID: 23830739

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