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Hagfish genome sequence sheds light on early vertebrate genome evolution - Nature Ecology & Evolution
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Sequencing of a hagfish genome — one of the two jawless vertebrate lineages (cyclostomes) — constrains the timing and nature of genome duplication events that characterize early vertebrate evolution. Genome duplications occurred among ancestral vertebrates and cyclostomes, but genome-doubling in ancestral jawed vertebrates was caused by hybridization, which resulted in an unparalleled morphological diversification.
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