Expression profile of pediatric ALL diagnostic bone marrow blasts. Shown is a 2-dimensional hierarchic cluster of 132 pediatric ALL diagnostic bone marrow samples (columns) versus the top 100 chi-square ranked probe sets (rows) for each of the 6 diagnostic subgroups of ALL. There were 12 probe sets identified as useful in discriminating more than one class and they are represented only once in the diagram. Probe set signal values are normalized to the mean for the dataset, and values for each individual case are represented by a color, with red representing deviation above the mean and green representing deviation below the mean. Genetic subtypes are indicated across the bottom of the panel.