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Schematic representation of mammalian introns detailing the regions used in this study. The positions of the 5′ and 3′ splice-junctions are indicated as 5′ SJ and 3′ SJ. Sequence logos, composed from 5000 randomly sampled human introns, are used to show the frequency composition of the splice-junctions. The intronic regions that are the basis of this study are indicated as DI (donor intronic) and AI (acceptor intronic).
