Figure 3From: Evaluation of gene expression data generated from expired Affymetrix GeneChip® microarrays using MAQC reference RNA samplesCorrelations of log 2 intensities generated in 2009 among the replicates of samples A and B (a) expired U133A microarrays and (b) unexpired U133Plus2 microarrays. Each scatterplot represents the comparison of log2 intensities of 8,550 common genes from two hybridizations.Back to article page