5VLC:
reference: Structures of Medicago truncatula L-Histidinol Dehydrogenase Show Rearrangements Required for NAD+ Binding and the Cofactor Positioned to Accept a Hydride., Ruszkowski M, Dauter Z, Sci Rep. 2017 Sep 5;7(1):10476. doi: 10.1038/s41598-017-10859-0. PMID: 28874718

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