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Phylogenetic tree constructed by the neighbor-joining method and based on the internal transcribed spacer 2 region sequencing of adult Trichostrongylus spp. worms recovered from humans and from a goat (bold letters). Sequence was deposited in GenBank. Values at nodes represent a bootstrap confidence level > 50% based on 1,000 re-samplings. The sexes of the worms are indicated in brackets.
