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    Are introns removed during transcription or after it? I tried searching around for an answer and most seem fairly vague. No huge rush for an answer just got curious. Thanks.
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    I believe that it can be either: as the pre-mRNA is produced or immediately after, within the nucleus, the spliceosome can attach to edit it/splice it.

    Supported by: http://www.ncbi.nlm.nih.gov/pubmed/21514162
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    Transcription is the process whereby you produce a molecule of pre-mRNA, that si to say the whole base sequence of a gene is copied. Then in a process called splicing, where the mRNA leaves the nucleus through the nuclear pores, the introns are edited out. Exons can also be spliced together in different ways, this allows you to produce different proteins from the same gene!
 
 
 
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