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Over 90% of the human genome consists of non-protein-coding regions. Introns constitute most of the non-coding regions located in precursor messenger RNAs (pre-mRNAs). During pre-mRNA maturation, the introns are excised out of mRNA and thought to be completely digested prior to translation. If the introns were merely metabolic ''leavings,'' why would the genome hold such a large amount of extraneous...
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