Figure 3.

Consensus unrooted phylogenetic tree of ribosomal protein S4. The tree was constructed from 1000 maximum-likelihood inferences. Node labels are bootstrap proportions estimated from 5000 replicates. Branches that are monophyletic with respect to a phylum or class and also with respect to a sequence classification have been collapsed, parentheses give the number of sequences in the branch. Colors indicate the sequence classifications: (white) C+, (gray) C-(I) – C-(III), (blue) C-(IV), and (yellow) C-(V). Sequences from genomes with multiple divergent copies of an S4 gene are marked with a (†) dagger. The two sequences marked with an (*) asterisk are identical copies resulting from large-scale genome duplication.