Fig. 2.

—Scattered and restricted distribution of Clp1-related proteins on bacterial phylogenetic tree. The number of bacterial Clp1-related proteins was mapped onto a bacterial phylogenetic tree consisting of 578 species with complete genome sequences (Wu and Eisen 2008). At the level of each phylum, the ratio of the number of Clp1-related proteins to the total number of species used in this study (see supplementary table S5, Supplementary Material online) is shown. The calculated ratio is also shown in parentheses. Phyla in which species possessed Clp1-related proteins are underlined in red.