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Phylogenetic tree constructed with sequences of the β-tubulin gene of B. microti U.S. lineage. GenBank accession numbers are given for each strain. Strains for which sequences were determined in this study are shown in boldface. The number on each branch shows the percent occurrence in 1,000 bootstrap replicates. Accession numbers of B. microti IpSG13-1-2, IpSG13-10-2, IpSG13-16-3, and IpSG13-18-1 are LC127373 to LC127376, respectively.
