Figure 2

Phylogenetic trees for fusion-linked COGs: α and β subunits of acyl-CoA:acetate CoA transferase. Fusion components are denoted by shading and by a number after an underline (_1 for the amino-terminal domain and _2 for the carboxy-terminal domain). The three primary kingdoms are color-coded as indicated in the figure. The RELL bootstrap values are indicated for each internal branch. (a) α subunit (domain) (COG1788); (b) β subunit (domain) (COG2057). The proteins are designated using the corresponding systematic gene names followed (after the underline) by the abbreviated species names. Species abbreviations are as in Materials and methods and Figure 1.