PCA plot of overrepresentated TFBS matrix families. PCA plot shown in terms of fold factor of overrepresentation in each subtype compared to the reference genomic promoters background. Blue lines represent the Eigen vectors, the direction and length of which indicates how each subtype variable contributes to the principal components in the plot. TFBS matrix families with maximum distance from the centroid are labeled on the plot.
Joshi et al. BMC Genomics 2012 13:199 doi:10.1186/1471-2164-13-199