SMALL FRACTION. “About 2% of the human genome is transcribed into mature protein-coding RNAs, while the large majority, between 70%–90%, is transcribed into non-protein coding RNAs (ncRNAs). ncRNAs include several types of RNA, exemplified by transfer RNAs (tRNAs), ribosomal RNAs (rRNAs) and small nuclear RNAs (snRNAs), with very well defined function in many cellular processes.”
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