Functional classification of representative genes modulated by imatinib mesylate, ATO, and imatinib mesylate plus ATO. Functional feature of each gene is determined based on detailed literature reading (see references in Table S2). All the relevant genes are grouped by hierarchical clustering based on expression values (log2 ratios) across all the samples (Table S2). Log2 ratios are color coded as indicated. Detailed descriptions of important genes mentioned in the text are listed in the “Appendix.”