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Unrooted maximum parsimony tree for all known class I LysRS sequences in the context of the sequences of CysRS, ArgRS, GluRS, and GlnRS from several bacterial, archaeal, and eukaryotic organisms. Numbers at nodes correspond to bootstrapping frequencies for 100 different trees. AF, A. fulgidus; BB, B. burgdorferi; TP, T. pallidum; MJ, M. jannaschii; MT, M. thermoautotrophicum.
