FIG. 2.

Phylogenetic placement of partial 16S rDNA sequences, amplified with the Oscillospira-specific primer set OSCI, within the main rumen bacterial phyla. Previously cloned Oscillospira sequences are labeled OSC1 through OSC5. The sequences generated in this work are labeled A through H. The Aquifex pyrophilus sequence is used as the outgroup for rooting the tree. Numbers above each node are confidence levels generated from 1,000 bootstrap trees (5). The scale bar is in fixed nucleotide substitutions per sequence position.