Fig. (2a) Dendrogram based on DGGE profiles representing 16S rRNA gene PCR-derived amplicons of BAL samples collected from C57Bl/6 dams exposed i.n. to either PBS (blue) or CNT particles (red) before mating (n=20). Most samples are very similar, but a few samples have intense bands that are absent or weaker in the remaining samples. These samples all belong to the 4 defining CNT samples from the CNT group. Reliably separated branches on the dendrogram have a high (green) cophenetic score.