Gene level comparison of human GWSA with the HG-U133 Plus 2.0 array. Gene annotations from the human GWSA were mapped against the U133 Plus 2.0 array and after removing the low expressed genes, 7147 genes remained for comparative analysis. Fold changes for each gene were calculated between samples A and B for each platform and plotted against each other. Correlation coefficients (found in table 1) were calculated based on fold change gene sets. A direct comparison of the intensity values was prevented due to the significant differences between the platforms (5 micron versus 11 micron feature size, different labeling technology, and probe sequences).