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Principal component analysis (PCA) plot showing the first three principal components of the microarray data set (a) unnormalized, (b) quantile normalized, (c) ComBat-adjusted, and (d) DWD-adjusted. Each sphere represents one sample; the color of the sphere indicates the different experimental runs. Run 1 to run 6 is represented by the following colors: run 1 = orange, run 2 = cyan, run 3 = dark blue, run 4 = yellow, run 5 = dark green, run 6 = pink.
