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Diagram of a possible role of CCA1 in circadian rhythms. The solid and dashed arrows represent potential interactions between CCA1 and LHY. Constitutive expression of CCA1 represses the expression of the LHY gene (4); the effect of constitutive expression of LHY on CCA1 has not yet been established. The wavy lines represent potential oscillators, and the solid line around CCA1 and LHY indicates possible redundant functioning of CCA1 and LHY in regulating rhythms of target genes.
