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Variation in gene expression in health and disease. Global gene expression was measured in 45 samples from each of five studies. See text for details on each sample set. Of the well-measured microarray elements, 3,826 were randomly selected from each group and variance was calculated for each. Variance was plotted in rank order (highest to lowest) for the genes in each of the specimen groups. DLCL, diffuse large B-cell lymphomas; CLL, chronic lymphocytic leukemia; WB, whole blood.
