4YLH:
reference: Oxygen diffusion pathways in a cofactor-independent dioxygenase., Di Russo NV, Condurso HL, Li K, Bruner SD, Roitberg AE, Chem Sci. 2015 Nov 1;6(11):6341-6348. Epub 2015 Jul 23. PMID: 26508997

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