FIG 4.
Phylogenetic tree constructed by using concatenated nucleotide sequences of 92 core genes of S. oriscaviae HKU75T and its closely related Streptococcus species. The tree was constructed by the neighbor-joining method using MEGA and Lactococcus lactis as the root. The gene names and accession numbers are given as cited in the Database of Clusters of Orthologous Genes (COGs) listed in supplemental Table S3. The Streptococcus genomes were classified into 9 taxonomic groups, namely, Bovis, Gordonii, Mitis, Mutans, Pluranimalium, Pyogenic, Salivarius, Sobrinus, and Suis. The color represents different taxonomic groups. The scale bar corresponds to the mean number of nucleotide substitutions per site on the respective branch. Bootstrap values were calculated as percentages from 1,000 pseudoreplicates (values lower than 70 are not shown).