5N8Y:
reference: Structures of the cyanobacterial circadian oscillator frozen in a fully assembled state., Snijder J, Schuller JM, Wiegard A, Lossl P, Schmelling N, Axmann IM, Plitzko JM, Forster F, Heck AJ, Science. 2017 Mar 17;355(6330):1181-1184. doi: 10.1126/science.aag3218. Epub 2017, Mar 16. PMID: 28302852

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