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Diurnal oscillations of LHY and CCA1 mRNAs in wild-type and CCA1-ox lines. Plants were grown in 16L:8D and 8L:16D photoperiods. Methylene blue staining was used to check equal loading. Representative northerns are shown. Relative levels of CCA1 and LHY RNA were plotted on the graphs. Experiments were performed twice with similar results. The black and yellow bars beneath the graphs represent dark and light photoperiods.
