5YFS:
reference: A presumed homologue of the regulatory subunits of eIF2B functions as ribose-1,5-bisphosphate isomerase in Pyrococcus horikoshii OT3., Gogoi P, Kanaujia SP, Sci Rep. 2018 Jan 30;8(1):1891. doi: 10.1038/s41598-018-20418-w. PMID: 29382938

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