Figure 5.

(A) Genome phylogeny based on nucleic acid sequences of genes encoding the ribosomal proteins of the alpha cluster. The tree was made from a genome distance matrix using the neighbor-joining method (18). Distances are expressed as substitutions per site. Similar results were obtained for the spc, str and S10 clusters (data not shown). Bootstrap value = 1000. (B) Tree after exclusion of the first base of the codon. (C) Tree after exclusion of the second base of the codon. (D) Tree after exclusion of the third base of the codon.