Intron-rich ancestors.

Abstract excerpt

Eukaryotic genes are interrupted by spliceosomal introns, which are removed from gene transcripts. The number of introns per gene varies by more than two orders of magnitude between species, implying that there has been extensive intron loss and/or gain throughout eukaryotic evolution. A recent study of intron positions in animals confirms that the ancestral bilaterian was rich in introns, and that differences in...

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