Supplement file 1. Phylogenetic tree of 16S rDNA sequences from fecal samples. The tree was rooted with an out-group species (Thermus thermophilus). Numbers at the internal branches indicate bootstrap values (expressed as percentage of 1000 replications) for groups. The scale bar represents 0.05 substitutions per nucleotide position. The figure after the clone number represents the size of the T-RF generated by computer model BslI-digestion of the sequence