C-E, Average CCA1:LUC bioluminescence traces of indicated plant lines. Data information: 18 to 27 seedlings per line were entrained in 12h/12h light/dark cycles for 7 d and next transferred to constant red light at ZT2 for image acquisition with 2-h intervals for 1 week. White and gray regions indicate subjective light and dark period. Data are representative of at least two independent trials with similar results. Different letters indicate statistically significant differences in period between genotypes (p<0.01, one-way ANOVA followed by Tukey-Kramer HSD test). 