The kinase and ATPase mechanisms.

Stereo diagrams depicting the active sites in the (A) KaiCII and (B) KaiCI halves of KaiC^nST. Carbon atoms of residues from adjacent subunits are colored in gray and green (subunits A and B, respectively), Mg²⁺ ions are depicted as blue spheres with coordination geometries indicated by bold lines and hydrogen bonds are dashed lines.