3K0C:
reference: Structures of KaiC circadian clock mutant proteins: a new phosphorylation site at T426 and mechanisms of kinase, ATPase and phosphatase., Pattanayek R, Mori T, Xu Y, Pattanayek S, Johnson CH, Egli M, PLoS One. 2009 Nov 26;4(11):e7529. PMID: 19956664

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