Figure 1.

Unrooted phylogeny of class I LysRSs. Phylogenies were constructed by using the maximum likelihood method (1,000 puzzling steps) implemented in the program puzzle 4.0 (48) and protein parsimony methods (200 bootstrap replicates) implemented in the Phylip package version 3.5c (J. Felsenstein, University of Washington). Numbers represent the percentage occurrence of nodes from maximum likelihood and protein parsimony methods, respectively. Sequences were aligned by using the program clustal x (49).