5U7E:
reference: Metal ion coordination in the E. coli Nudix hydrolase dihydroneopterin triphosphate pyrophosphatase: New clues into catalytic mechanism., Hill SE, Nguyen E, Ukachukwu CU, Freeman DM, Quirk S, Lieberman RL, PLoS One. 2017 Jul 25;12(7):e0180241. doi: 10.1371/journal.pone.0180241., eCollection 2017. PMID: 28742822

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