Figure 2.
Two-dimensional principal component analysis (PCA) of log10 signal intensities in arrays derived from 25 treated and 25 untreated rats in seven tissues. The 500 genes with the highest standard deviation across the resulting 350 arrays were selected for this analysis. PCA was implemented in the Spotfire Decision Site software package (http://www.spotfire.com). Samples are colored by tissue of origin. Circles are samples derived from drug-treated animals, and triangles are from untreated controls.
