Phylogenies of toxin-antitoxin proteins of pRAS3 and comparison with closely related proteins as well as the more distantly related PemIK and MazEF proteins. (A) Antitoxins were as follows: Aromatoleum aromatium, CAI08016; Bartonella tribocorum, CAK00897; Dinoroseobacter shibae, YP_001541878; Nitrosomonas europaea ATCC 19718, CAD85218; Xanthomonas axonopolis pv. citri strain 306, NP_644761; Xanthomonas campestris pv. vesicatoria strain 85-10, CAJ19793; Xylella fastidiosa Ann-1, ZP_00682677; E. coli MG1165 MazE, AAA69293; plasmid R100 PemI, P13975. (B) Toxins were as follows: Aromatoleum aromatium, CAI08015; Bartonella tribocorum, CAK00896; Chlorobium ferrooxidans, EAT59633; Nitrosomonas europaea ATCC 19718, CAD85217; Pseudomonas syringae pv. phaseolicola, AAZ37969; Xanthomonas axonopolis pv. citri strain 306, NP_644760; Xanthomonas campestris pv. vesicatoria strain 85-10, CAJ19792; E. coli MG1165 MazF, AAA69292; plasmid R100 PemK, P13976.