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The primary RNA transcript of the chicken ovalbumin gene is 7700 nucleotides long, but the mature mRNA that is translated on the ribosome is 1872 nucleotides long. This size difference occurs primarily as a result of:

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I’m pretty sure it’s because the introns are removed and the Exon’s are kept and joined together to leave the cell. This happens during splicing..
User Andyf
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