2IC2:
reference: Structure of a heparin-dependent complex of Hedgehog and Ihog., McLellan JS, Yao S, Zheng X, Geisbrecht BV, Ghirlando R, Beachy PA, Leahy DJ, Proc Natl Acad Sci U S A. 2006 Nov 14;103(46):17208-13. Epub 2006 Oct 31. PMID: 17077139

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