The evolutionary position of nematodes |
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Authors: | Jaime E Blair Kazuho Ikeo Takashi Gojobori S Blair Hedges |
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Affiliation: | (1) Astrobiology Research Center and Department of Biology, The Pennsylvania State University, 16802 University Park, PA, USA;(2) Center for Information Biology, National Institute of Genetics, 411-8540 Mishima, Shizuoka-ken, Japan |
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Abstract: | Background The complete genomes of three animals have been sequenced by global research efforts: a nematode worm (Caenorhabditis elegans), an insect (Drosophila melanogaster), and a vertebrate (Homo sapiens). Remarkably, their relationships have yet to be clarified. The confusion concerns the enigmatic position of nematodes. Traditionally, nematodes have occupied a basal position, in part because they lack a true body cavity. However, the leading hypothesis now joins nematodes with arthropods in a molting clade, Ecdysozoa, based on data from several genes. |
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