Figure 1.

Phylogenetic tree of the Bifidobacterium genus based on the concatenation of 191 core amino acid sequence genes. The core genes-based tree shows the subdivision of the 10 phylogenetic groups of the Bifidobacterium genus represented with different colors. The phylogenetic tree was built by the neighbor-joining method with corresponding sequences of Scardovia inopinata JCM 12,537 being employed as outgroup. Bootstrap percentages above 50 are shown at node points, based on 100 replicates of the phylogenetic tree. The ecological origins of the various phylogenetic groups are highlighted beside the phylogenetic tree.