fig1

Figure 1. Distribution of T4P structure across the Bifidobacterium genus. The phylogenomic tree is based on the concatenation of 174 core protein sequences of 117 reference strains of the genus. The tree was constructed by the Neighbour-joining method, with the genome sequence of Scardovia inopinata JCM 12537 as outgroup. The different colors in the inner circle indicate the division into phylogenetic groups, while the outer circles illustrate the distribution and configuration of the T4P. T4P: Type IV pili; T4aP: type IVa pili; tad: tight adherence.