Fig. 1: Cryo-EM maps of KaiC-AA and KaiC-EE.

a Top and side view of KaiC-AA, with CII and CI domains colored in dark green and green and in blue and light blue, respectively. The 12 ATP molecules bound are colored in yellow. b Top and side view of KaiC-EE, with CII and CI domains colored in red and pink and in orange and yellow, respectively. The 12 ATP molecules bound are colored in blue. c, d show typical high-resolution densities of the secondary structures in the cryo-EM structure of KaiC-AA (c) and of KaiC-EE (d).