Fig. 2

The phylogenetic analysis and gene structure comparison of 26 GBS CC103 strains. a The phylogenetic analysis of 26 GBS CC103 strains based on genome sequences, and the phylogeny was constructed with 1,000 bootstrap replications and rooted by the result of Fig. 1. A few strains with non-frequent ST and serotypes are highlighted in red. b Comparison of CRISPR1 loci. Internal repeats are not included; only terminal repeats (RT) and spacers are represented. The spacers are numbered, and same number represents the same sequence. The colors are used to emphasize the major spacers for easier viewing, and the same spacers are represented by same colors. c Gene structure comparisons of Lac.2 and CadDX. Lac.2–1 and Lac.2–2 are two types of Lac.2. +, the strain has this gene; −, the strain does not have this gene structure. *, there’s a gap at the CRISPR1 sequence