Microarray analysis of myeloid differentiation. (A) Heat map of the 27 127 “expressed” probe sets (with MAS 5 “present” call and > 150 signal units for at least one day) in experimental set 1, normalized to the percentage of the maximal value of each probe set from days 0 to 7. (B) Definition of the most highly expressed probe sets on each day of differentiation (100 for each day) chosen by z-score analysis. A heat map displaying z-score values for each of the selected probe sets on all days of differentiation are shown. (C) The top 100 probe sets for each day (as displayed in B) were replotted with the data from experimental set 2. Day-1 data were not available for this set. (D) Graphic representation of the absolute signal values from the top 100 probe sets on each day of myeloid differentiation from set 1, as defined in panel B. (E) Biological process classification of the genes shown in panel B.