(A) Rhythms of bioluminescence generated by PkaiBC::luc expression were monitored for entrained WT (black), ΔkaiC (blue), ΔrpaA (gray), and rpaA-R121Q (salmon) cyanobacterial strains. Each plot represents an average of six biological replicates. kcps, kilocounts per second. (B) Rhythms of RpaA phosphorylation or (C) FA of PkaiBC DNA in IVC reactions containing either SasA or CikA, as in Fig. 1, A and B.