2ZTS:
reference: Crystal structure of KaiC-like protein PH0186 from hyperthermophilic archaea Pyrococcus horikoshii OT3., Kang HJ, Kubota K, Ming H, Miyazono KI, Tanokura M, Proteins. 2009 Jan 14. PMID: 19274727

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