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.