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Replacement of the E-box in the c3 promoter abolishes its circadian expression. The transgenic wild-type strains crluc5b (A) and crluc5c (B), expressing the chimeric crluc reporter gene under the control of the 300-bp c3 promoter in its native form (A) or under replacement of its E-box (B), were grown in a 12/12-h light/dark cycle and then released to constant dim light (LL). cRLUC activities (n = 3) were measured at the indicated time points according to Kiaulehn et al. (2007).
