Differential expression of the new markers according to the genetic subtype of ALL. Heatmap shows the percentage of cases among the main genetic subtypes of childhood ALL in which the markers studied were differentially expressed by flow cytometry. Percentages refer to cases in which each marker was overexpressed in ALL cases compared with CD19⁺CD10⁺ cells from nonleukemic BM samples; markers underexpressed in ALL cells are indicated by “u.” All markers differentially expressed in at least 20% of cases were included.