5U6R:
reference: Human CTP synthase filament structure reveals the active enzyme conformation., Lynch EM, Hicks DR, Shepherd M, Endrizzi JA, Maker A, Hansen JM, Barry RM, Gitai Z, Baldwin EP, Kollman JM, Nat Struct Mol Biol. 2017 May 1. doi: 10.1038/nsmb.3407. PMID: 28459447

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