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site), respectively.
# The 5' splice site sequence is then subjected to a nucleophilic attack by a downstream sequence called the branch point, resulting in a circular structure called a lariat.
# The free 5' exon then attacks the 3' splice site, joining the two exons and releasing a structure known as an intron lariat. The intron lariat is subsequently de-branched and quickly degraded.

Alternative splicing

Alternative splicing is

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