Eukaryotic pre-mRNA processing | RNA splicing (article) - Khan Academy
https://www.khanacademy.org/science/ap-biology/gene-expression-and-regulation/transcription-and-rna-processing/a/eukaryotic-pre-mrna-processing
WEBA sequence of DNA encodes a pre-mRNA transcript that contains five regions that may potentially be used as exons: Exon 1, Exon 2, Exon 3, Exon 4, and Exon 5. The exons are arranged in linear order along the pre-mRNA and have introns in between them.
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