4C4N:
reference: Structural insights into proteoglycan-shaped Hedgehog signaling., Whalen DM, Malinauskas T, Gilbert RJ, Siebold C, Proc Natl Acad Sci U S A. 2013 Oct 8;110(41):16420-16425. Epub 2013 Sep 23. PMID: 24062467

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