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We suggest that failure of exon 6A to splice to exon 6B is due to the existence of some structural constraints which lower the efficiency with which the intron between them is excised.
While not excised by exon 2 alone, intron A was efficiently excised when exon 3 and/or exon 4 was combined with exon 2, suggesting the presence of exonic splicing enhancers (ESEs) in exons 3 and 4.
This knowledge allows us to optimize therapeutic exon skipping, but also opens up a range of other applications for the exon skipping approach.
We also found evidence for an alternative use of exon 1.
These results strongly suggest that factors binding immediately upstream of exon 6 are involved in regulation of this exon.
They also lead to the conclusion that splicing of exon 6 is primarily governed by multiple branch points.
Finally, these studies demonstrate that exon 10 is also used as an alternatively spliced exon.
Open accessJournal ArticleDOI
I T Chen, Lawrence A. Chasin 
33 Citations
We conclude that a limitation in exon size is not part of the exon definition mechanism.

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