4IJM:
reference: Loop-Loop Interactions Regulate KaiA-Stimulated KaiC Phosphorylation in the Cyanobacterial KaiABC Circadian Clock., Egli M, Pattanayek R, Sheehan JH, Xu Y, Mori T, Smith JA, Johnson CH, Biochemistry. 2013 Feb 7. PMID: 23351065

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