FIG. 2.

Neighbor-joining tree for human oral taxa in the class Clostridia of the phylum Firmicutes. Labeling and methods used are as described in Fig. 1. Major clades are marked as follows: encircled “1,” Collins XI; encircled “2,” Peptostreptococcaceae; encircled “3,” Collins XIII; encircled “4,” unnamed family F1; encircled “5,” Collins XV, Eubacteriaceae; encircled “6,” Collins XIVa, Lachnospiraceae; encircled “7,” Peptococcaceae; encircled “8,” Collins XIII, Syntrophomonadaceae; and encircled “9,” unnamed family F2.