Cells are small factories that constantly produce protein and RNA molecules by decoding the genetic information stored in the DNA of their chromosomes. The first phase of this decoding, the transcription process, ‘transcribes’ the DNA code into RNA molecules. In humans, and most other organisms, all cells of the body carry the full genetic information of the entire organism, with each individual cell requiring only a small subset of its DNA decoded. Even so, the first decoding phase (transcription) is pervasive and produces a large amount of surplus RNAs.
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Source: Phys.org