Maximum likelihood tree of RimK sequences. RimK sequences were retrieved from UniProt  and from the GOS metagenomic data set using BLASTP. The phylogenetic reconstruction was performed using PhyML  (Jones-Taylor-Thornton substitution model , 100 bootstrap replicates) based on a multiple sequence alignment generated with MUSCLE . Bootstrap values lower than 50% are not shown. The tree was mid-point rooted. GOS sequences are marked with filled circles and displayed in purple. The length of the scale bar corresponds to 0.4 substitutions per site.