4R0L:
reference: Anti-CD28 Antibody-Initiated Cytokine Storm in Canines., Rosinski SL, Storb R, Strong RK, Sale GE, Stone DM, Gewe MM, Friend DJ, Abrams VK, Randolph-Habecker J, Graves SS, Transplant Direct. 2015 Mar;1(2). doi: 10.1097/TXD.0000000000000516. PMID: 25988188

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