1LR8:
reference: Crystal structures of the heparan sulfate-binding domain of follistatin. Insights into ligand binding., Innis CA, Hyvonen M, J Biol Chem 2003 Oct 10;278(41):39969-77. Epub 2003 Jul 16. PMID: 12867435

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