The introns are the portions of genomic DNA which are transcribed (and hence present in the primary transcript) but are then spliced out later. They therefore are not present in the matured mRNA. Note that though the 3' flanking region is often transcribed, it is removed by using endonucleolytic cleavage and not by the splicing. It is not an intron.

Posted Date: 8/3/2012 7:04:42 AM | Location : United States

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