Heat map of probe sets associated with patient age. The top 43 probe sets associated with age (as a continuous variable) at the significance level FDR = 15% were used to generate a heat map. Patients are ordered from left to right by ascending age. In addition to the 97 infant ALL patients, 21 pediatric MLL cases are included. Vertical white lines indicate the positions of age landmarks, and the horizontal line separates between the probe sets whose expressions are positively (top) and negatively (bottom) correlated with age. Age of patients is indicated across the top.