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Only a small fraction of your DNA spells out a protein. The rest is doing other things.

Biology Facts, sourced to MedlinePlus.

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Around one or two percent of the sequence codes for proteins. The remainder was called junk for years, which turned out to be a confession rather than a finding. A good deal of it is regulatory: switches that decide which genes run in which cells and when, spacers, structural regions that hold chromosomes together, and instructions for RNA molecules that do jobs of their own without ever becoming a protein.

The claim comes from MedlinePlus.

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