The phylogenic relationship between BTLCP-linked and classical ABC transporters. Phylogenetic analysis of bacteriocin, RTX toxin, and BTLCP-linked ABC transporters involved in T1SS. The web tool http://www.phylogeny.fr/ was used to construct the phylogenic tree with default settings. Bootstrap values are indicated in red and bolded. WebLogo results of residues at regions critical for bacteriocin processing (purple, C) and RTX binding (blue, Y) are shown. The corresponding region for the BTLCP-linked ABC transporters, lacking these residues, is also shown.