3NUG:
reference: The crystal structure of SDR-type pyridoxal 4-dehydrogenase of Mesorhizobium loti., Chu HN, Kobayashi J, Mikami B, Yagi T, Biosci Biotechnol Biochem. 2011;75(2):388-90. Epub 2011 Feb 7. PMID: 21307574

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