5E4E:
reference: Instructive roles for cytokine-receptor binding parameters in determining signaling and functional potency., Moraga I, Richter D, Wilmes S, Winkelmann H, Jude K, Thomas C, Suhoski MM, Engleman EG, Piehler J, Garcia KC, Sci Signal. 2015 Nov 10;8(402):ra114. doi: 10.1126/scisignal.aab2677. PMID: 26554818

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