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Extracellular structures identified among members of the Bifidobacterium genus. The bifidobacterial phylogenetic tree is based on the core gene sequences conserved in each bifidobacterial (sub)species. Colored dots show the presence of the different extracellular structures distributed among the Bifidobacterium genus. The bifidobacterial colors are related to the ecological origin of each bifidobacterial (sub)species.
