Figure 7
Principal component analysis of brain tissue correlation profiles. Principal component analysis of 10-dimentional vectors of correlation coefficients between transcript expression profile and beta actin ratio was performed. The first principal component scores of 44792 common transcripts (HG-U133_Plus_2.0 chip versus HG-U133_AB chip) are shown. Positive scores correspond to positive correlation to beta actin ratio and negative scores correspond to negative one. Points with top positive and top negative scores demonstrate consistent RNA quality dependency through 10 brain tissues and 2 chip hybridizations.