Intron I
Exon l Exon 3 aaaaa
Intron 2 Intron I, exon 2, and intron 2
Transcription
Pre-mRNA 5'lExonl jO I©3' cleavage sites 3'
Cleavage may occur at 3' site 1.
3' cleavage and polyadenylation
51 Exon l aaaaa 3' 51 Exon l
Exon 2
RNA splicing mRNA
aaaaa 3'
mRNA products of different lengths are produced after splicing.
Intron I
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