Results of the Principal Component Analysis (PCA) on individual sample profiles obtained by phylogenetic microarray. A) the plot of the PCA axis 1 (accounting for 21% of intersample variation) and the axis 2 (14% of intersample variation) B) the plot of the PCA axis 2 and the axis 3 (11.4% of intersample variation). Green dots - samples from the caries-free group, blue dots - samples from the treated group, red dots - samples from children with dental caries. Samples identified with the same number belonged to the siblings from one family. Samples without numbers belonged to unrelated individuals.
Crielaard et al. BMC Medical Genomics 2011 4:22 doi:10.1186/1755-8794-4-22