New Drosophila introns originate by duplication.


We have analyzed the phylogenetic distribution of introns in the gene coding for xanthine dehydrogenase in 37 species, including 31 dipterans sequenced by us. We have discovered three narrowly distributed novel introns, one in the medfly Ceratitis capitata, the second in the willistoni and saltans groups of Drosophila, and the third in two sibling species… (More)


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