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Diagram of hypothetical mRNA transcript with its potential AE cut sites (indicated by arrows) and their tag formation probability φj. AE sites are assumed to be cleaved independently of one another with cleaving efficiency p. From an individual mRNA, the tag formed is from the 3' most AE site that is actually cleaved. The probability of forming a tag at the jth site is, therefore, p(1 - p)(k - j).
