Inter-platforms agreement in gene lists. Venn diagrams showing the overlap of genes identified as differentially expressed between macrophage and monocyte samples in the 2 compared platforms and the reference. Three different criteria were used to select gene lists: (a) Pc < 0.001, (b) Pc < 0.05 combined to fold-change >2 as suggested in the MAQC project and (c) "Best-3800" probes on each platform. Only a set of transcripts common to the 3 platforms was used in this comparison. Gene lists include both up- or down- regulated genes.