3URF:
reference: Crystal Structure of Human RANKL Complexed with Its Decoy Receptor Osteoprotegerin., Luan X, Lu Q, Jiang Y, Zhang S, Wang Q, Yuan H, Zhao W, Wang J, Wang X, J Immunol. 2012 Jul 1;189(1):245-52. Epub 2012 Jun 4. PMID: 22664871

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