4LIS:
reference: Elucidation of Substrate Specificity in Aspergillus nidulans UDP-Galactose-4-Epimerase., Dalrymple SA, Ko J, Sheoran I, Kaminskyj SG, Sanders DA, PLoS One. 2013 Oct 7;8(10):e76803. doi: 10.1371/journal.pone.0076803. PMID: 24116166

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