Fig. 1. Phylogenomic tree and gene content dendrogram of roseobacters.

A Maximum likelihood phylogenomic tree showing the position of CHUG in the Roseobacter group. The phylogeny was inferred using IQ-TREE v1.6.2 [37] based on a concatenation of 45,904 amino acid sites over 120 conserved bacterial proteins [33]. Solid circles in the phylogeny indicate nodes with bootstrap values >95%. The potential of aerobic (key gene cobG, red) and anaerobic (key gene cbiX, green) cobinamide synthesis (the first stage of Vitamin B₁₂ synthesis) is labeled at the tips. B Dendrogram of the same Roseobacter genomes based on the presence/absence pattern of orthologous gene families.