Hierarchic clustering based on transcripts modified by low-dose radiation. We detected 201 transcripts whose expression was significantly modified by low-dose radiation. Hierarchic clustering based on their expression is shown, with samples taken before radiation in blue and samples taken after radiation in red, in the columns. For each gene, the relative expression compared with the reference RNA is represented by a color scale. Based on their regulation and functions, genes (rows) were classified in 3 biologically meaningful profiles: p53 targets in red, immune response in blue, and cell cycle in green.