FIGURE 5. Alternative poly(A) sites.
From the following article:
Generation of neuronal variability and complexity
Alysson R. Muotri and Fred H. Gage
Nature 441, 1087-1093(29 June 2006)
doi:10.1038/nature04959
a, Choosing from several distinct polyadenylation sites, transcripts with 3'-differential exons can be generated. b, Truncation of the GluR1 carboxy-terminal by alternative splicing redirects the protein product from neuronal dendrites (dominant signal 1012-71) to axons (RRK motif)96. 7 TM, seven transmembrane-spanning region.