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As far as i know, introns do not encode protein products, but living creatures still have them. So what’s their function ?

P/s: Sorry for my grammar

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    $\begingroup$ Welcome to SE Biology. As you will see, this question has been asked before. You can find out whether your question has already been covered by searching for a term of interest like "intron". If you are on a desktop or laptop you will any case see a list of related questions in the right-hand sidebar. Also see How to ask good questions in the Help. $\endgroup$ – David Oct 13 '19 at 21:33
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Eukaryotic organisms possess introns for few purposes. One of them which i know is protein isoform formation, where different combinations of exons can give rise to different forms of the same protein which wouldn't have been possible otherwise , if we only had exons. Also introns code for SiRNAs and few other RNAs.

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