FIG. 1.

Neighbor-joining tree for human oral taxa in the phylum Tenericutes and the classes Bacilli and Erysipelotrichia of the phylum Firmicutes. The name of each taxon is followed by the oral taxon number, clone or strain number, GenBank accession number, the number of clones out of 34,879 that were identified as this taxon, and a symbol indicating that the taxon is a named species (•), an unnamed cultivated taxa (▪), or an uncultivated phylotype (□). The tree was constructed with MEGA 4.3 using the Jukes and Cantor correction neighbor-joining distance matrix. Comparisons with missing data were eliminated pairwise. The numbers to the left of the branches indicate the percentage of times the clade was recovered out of 1,000 bootstrap resamplings. Only bootstrap percentages greater than 50 are shown. Roman numerals in square brackets following a genus name indicate Collins' Clostridia cluster numbers (17). Major clades are marked as follows: encircled “1,” Bacilli; encircled “2,” Firmicutes; encircled “3,” Erysipelotrichia; and encircled “4,” Tenericutes (previously know as the class Mollicutes within Firmicutes).