Conclusion: Both alternate splicing and multiple 3' cleavage sites produce different mRNAs from a single pre-mRNA.

14.16 Eukaryotic cells have alternative pathways for processing pre-mRNA. (a) With alternative splicing; pre-mRNA can be spliced in different ways to produce different mRNAs. (b) With multiple 39 cleavage sites, there are two or more potential sites for cleavage and polyadenylation; use of the different sites produces mRNAs of different lengths.

Exon 1

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