Differential gene expression profile comparing EPs and GMPs. RNAs from cell sorter-purified EPs and GMPs from normal mice were analyzed by microarray analyses for differences in global gene expression. Panel A depicts a selection of genes that are highly and differentially expressed in either GMPs (top) or EPs (bottom). Depicted is the fold difference in GMP over EP (positive numbers) and EP over GMP (negative numbers) hybridization signals. Panel B shows the relative expression pattern of transcription factors in alphabetical order comparing EPs and GMPs. Red indicates increased expression; black indicates lack of expression. Repeats of the same gene name reflect distinct probes for that gene. The full list of expression data has been deposited at http://www.ncbi.nlm.nih.gov/geo.