Heat map of differentially expressed probe sets between high and low BAALC expression groups in BCR-ABL⁻ and MLL-AF4⁻ ALL. Columns represent samples and rows represent genes ordered by hierarchical cluster analysis. Colors indicate relative expression of each gene with respect to the median expression level: red indicates above median value; yellow, equal; blue, below median value. Heat map of differentially expressed probe sets between high and low BAALC expression groups in BCR-ABL⁻ and MLL-AF4⁻ ALL.