In the control condition, two main groups of genes had phases at the beginning and at the end of the night (ZT14-15 and ZT22-23) (Fig. 2C); in the CF and Arntl KO conditions, only 504 and 582 of these 1132 genes, respectively, still had amplitudes above 0.25; as expected from the phase correlations above, the distribution of their phases was quite similar in the CF condition, but very different in the Arntl KO conditions, with prominent groups of genes displaying phases in the middle of the day and the middle of the night (Fig. 2C). This evidence concerns the gene BMAL1 and cystic fibrosis.