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The boxplot of the Kullback-Leibler distances with each array generation and normalization. The KL-distances of 126 housekeeping genes from each array generation from all 6,926 samples were computed. Each boxplot includes the KL-distances of the 126 genes. The array generations are ordered within each of the normalization methods in chronological order of array generations; Hu6800, HG-U95A, HG-U95Av2, HG-U133A and HG-U133 Plus 2.0.
