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Biology and Medical
What Are Introns? Understanding Their Role in Gene Expression
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[QUOTE="Ygggdrasil, post: 6047202, member: 124113"] Yup, that is correct. For example, here's a diagram showing the exons (thick bars) and introns (thin bars) for the various splicing variants of a fairly typical gene, GAPDH (encoding the glycolytic enzyme, glyceradehyde-3-phosphate dehydrogenase): [ATTACH=full]229893[/ATTACH] [URL]https://www.ncbi.nlm.nih.gov/gene/2597[/URL] As you can see, there is much more intronic, non-coding sequence in the gene than exonic, protein-coding sequence. Furthermore, of the exons, only the parts colored in dark green actually code for protein. The exonic regions in light green at the beginning and end of the transcripts encode the 5' and 3' untranslated regions of the mRNA, which do not get translated into protein. Weird, right? [/QUOTE]
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What Are Introns? Understanding Their Role in Gene Expression
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