Unrooted phylogeny of class I LysRS proteins. The phylogeny was
constructed by using the maximum likelihood method (5,000 puzzling
steps) implemented in the program TREE-PUZZLE 4.0.2
under the JTT model. ✖, genome does not encode AsnRS;
√, genome encodes AsnRS; ?, genome sequence
incomplete, AsnRS encoding gene not yet detected.