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Neighbor-joining tree showing the phylogenetic relationship of Babesia sp. (sable) with other Babesia and Theileria species based on 18S rRNA gene sequences. The GenBank accession numbers are indicated in parentheses. Branch lengths are proportional to the estimated genetic distance between the strains. The scale bar represents the percent nucleotide difference. Vertical lengths are not significant and are merely set for clarity. Plasmodium falciparum (M19172) was used as an outgroup.
