Figure 2From: Metabonomics evaluations of age-related changes in the urinary compositions of male Sprague Dawley rats and effects of data normalization methods on statistical and quantitative analysisPCA scores and loadings normalized to total intensity. (A) 2D PCA scores and loadings plots of NMR data normalized to total spectral intensity from urine samples of 25-day (red circles), 40-day (blue circles), and 80-day (yellow circles) old control SD rats at all timepoints. (B) The PC1 and PC2 loadings for the negative NMR PCA analysis.Back to article page