Microarray cluster analysis demonstrating differentially expressed genes in HeLaT-β-catenin-RNAi cells treated with DOX. After 3 days of treatment, 50–100 μg of DNA-free total RNA from control or induced cells was reverse transcribed and labeled with Cy3 or Cy5 and then hybridized to the oligonucleotide microarray containing 1384 apoptosis-related genes. Microarray experiments were performed comparing induced vs. control cells. Shown here are the intensity ratios of 5 separate experiments (a) or means ± S.D (b). The color bar represents the intensity ratio of induced vs. control cells.