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Phylogenetic relationships among of F. hepatica based on partial sequences of the mitochondrial cytochrome oxidase subunit I (COI) gene. P. westermani (AF219379) was used as outgroup. The phylogenetic tree was constructed using maximum likelihood analysis, conducted in PHYLIP package. Numbers at nodes represent percentage occurrence of clades in 1,000 bootstrap replications of the data. Maximum parsimony analysis resulted in the same tree topology (data not shown)
