1VKJ:
reference: Crystal structure and mutational analysis of heparan sulfate 3-O-sulfotransferase Isoform 1., Edavettal SC, Lee KA, Negishi M, Linhardt RJ, Liu J, Pedersen LC, J Biol Chem 2004 Apr 1;. PMID: 15060080

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