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Maximum likelihood tree of C1A proteinase amino acid domains of Babesia, Theileria, and Cytauxzoon parasites. Each C1A cysteine proteinase sequence is designated with the corresponding piroplasmid species and accession number. Numbers 1–8 designate revealed C1A cysteine proteinase Groups 1–8. OG, outgroup. Bootstrap values based on 1000 replicates are displayed next to the branches.
