IR is rapidly induced by light. (A) Expression profiles of top 1,000 red (left) and blue (right) light-regulated IR isoforms and corresponding genes. IR level (IR) and corresponding gene expression level (Gene expression) for the top 1,000 IR events were normalized by mean across samples, respectively. Heat maps of these events in dark-grown (D), 1-h light-treated (R1 and B1), and 4-h light-treated (R4 and B4) samples are shown. Events were arranged according to the fold-change of IR level comparing 1-h light-treated to dark-grown samples. The scale of expression is shown on the top of each figure. Heat maps of expression levels of IR isoforms and corresponding genes encoding ribosomal proteins in red-light sample (B), and chloroplast proteins and ribosomal proteins in blue-light sample (C) are shown.