Differential gene expression in O. tauri subjected to LD 12:12 cycles. (A) ANOVA Analysis. 6822 probes detect genes with differential expression over 3 LD cycles with a Pvalue < 10-3. (B) Principal Component Analysis (PCA) of samples collected at different times of the LD cycle represented on a correlation circle. White and Dark represent light and dark period respectively (12:12; Light ON at Time 9; Light OFF at Time 21). Biological replicates are shown separately as dots. Note that the Time 9 overlapping time points are grouped. (C) Separation of genes by the first and second components of PCA shown on the x and y axis, which represent 41.7% and 23.6% respectively. The main axis partition morning/evening and night/day time points. At time 0, fewer genes are expressed.