Fig. 4

Phylogenetic trees of EtfA (a), EtfB (b), and concatenated EtfA_EtfB (c) proteins for selected species (see Materials and Methods). After the name of species there is a shortcut for the relevant enzyme coded in the vicinity of etfA/B: _GlcD—in the vicinity of FAD/FMN-containing dehydrogenase, probable D-lactate dehydrogenase (genetic context arrangement similar to fragment 1 in Fig. 2); _3-hydroxybutyryl-CoA—in the vicinity of 3-hydroxybutyryl-CoA dehydrogenase (genetic context arrangement similar to fragment 2 in Fig. 2); _LldP_GlcD—in the vicinity of l-lactate permease and FAD/FMN-containing dehydrogenase, probable d-lactate dehydrogenase (genetic context arrangement similar to fragment 3 in Fig. 2); _acyl-CoA—in the vicinity of acyl-CoA dehydrogenase