Revolutionary functional genomics liberates CHE.

A high-throughput one-hybrid screen identifies a regulator of the Arabidopsis thaliana circadian gene CIRCADIAN CLOCK ASSOCIATED1 (CCA1). CCA1 HIKING EXPEDITION (CHE) represses CCA1 and physically interacts with TIMING OF CAB1 (TOC1) to link TOC1 with CCA1 in the clock.