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Maximum likelihood phylogenetic tree of 18S rRNA sequences amplified from human blood with 13 published sequences of ten different reference Babesia species for comparison, plus Plasmodium falciparum as an outgroup, represent the relationship of Subject 1 and Subject 2 to other Babesia spp. Alphanumeric values in brackets denote published GenBank sequences. The scale bar represents the percentage of genetic variation along the tree branches.
