1UMY:
reference: Crystal structure of rat liver betaine homocysteine s-methyltransferase reveals new oligomerization features and conformational changes upon substrate binding., Gonzalez B, Pajares MA, Martinez-Ripoll M, Blundell TL, Sanz-Aparicio J, J Mol Biol 2004 May 7;338(4):771-82. PMID: 15099744

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