6BLM:
reference: A global view of structure-function relationships in the tautomerase superfamily., Davidson R, Baas BJ, Akiva E, Holliday GL, Polacco BJ, LeVieux JA, Pullara CR, Zhang YJ, Whitman CP, Babbitt PC, J Biol Chem. 2017 Nov 28. pii: M117.815340. doi: 10.1074/jbc.M117.815340. PMID: 29184004

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