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. Author manuscript; available in PMC: 2011 May 1.
Published in final edited form as: Exp Cell Res. 2010 Mar 6;316(8):1357–1364. doi: 10.1016/j.yexcr.2010.02.040

Figure 1. Types of alternative polyadenylation.

Figure 1

There are three common types of alternative polyadenylation: (A) skipped-exon associated 3′ UTRs, as exemplified by the Calcitonin/CGRP gene locus, (B) composite exons associated 3′ UTRs, similar to the Immunoglobulin μ heavy chain, and (C) single terminal exons with two or more polyA sites (often called tandem UTRs), as illustrated by Dihydrofolate reductase and its seven mapped polyA sites.