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Maximum likelihood phylogenetic tree of Trypanosoma cruzi strains based on Cyt b gene sequences inferred with the model GTR+G (G=0.1130, -lnL=3851.9282). Numbers at nodes are the support values derived from 1000 replicates. TcI, TcII, and TcV-TcVI are the three clusters supported by significant bootstrap values representing the genotypes of T. cruzi. A, B, subgroups within each cluster.
