1UDB:
reference: Structural analysis of UDP-sugar binding to UDP-galactose 4-epimerase from Escherichia coli., Thoden JB, Hegeman AD, Wesenberg G, Chapeau MC, Frey PA, Holden HM, Biochemistry 1997 May 27;36(21):6294-304. PMID: 9174344

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