PRJDB3468 Genome-wide gene expression profile of Arabidopsis thaliana cca1 lhy double mutant. CCA1 and LHY are homologous genes involved in circadian clock system in Arabidipsis thalina. To examine downstream genes under CCA1- and LHY-control, cca1 lhy double mutants and wild-type grown under 12 h light / 12 h dark conditions were harvested at 1 hr after light on, when CCA1 and LHY are expressed. Genome-wide gene expression profile of Arabidopsis thaliana cca1 lhy double mutant. bioproject PRJDB3468 PRJDB3468 true CCA1 and LHY are homologous genes involved in circadian clock system in Arabidipsis thalina. To examine downstream genes under CCA1- and LHY-control, cca1 lhy double mutants and wild-type grown under 12 h light / 12 h dark conditions were harvested at 1 hr after light on, when CCA1 and LHY are expressed.