2L3Y:
reference: Conservation of functional sites on interleukin-6 and implications for evolution of signaling complex assembly and therapeutic intervention., Veverka V, Baker T, Redpath NT, Carrington B, Muskett FW, Taylor RJ, Lawson AD, Henry AJ, Carr MD, J Biol Chem. 2012 Nov 16;287(47):40043-50. doi: 10.1074/jbc.M112.405597. Epub, 2012 Oct 1. PMID: 23027872

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