1KVU:
reference: Mechanistic roles of tyrosine 149 and serine 124 in UDP-galactose 4-epimerase from Escherichia coli., Liu Y, Thoden JB, Kim J, Berger E, Gulick AM, Ruzicka FJ, Holden HM, Frey PA, Biochemistry 1997 Sep 2;36(35):10675-84. PMID: 9271498

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