What does the rest of the DNA do?
Most of the DNA sequence in our genome is not used to make protein; amazingly only 2% of it is! The rest of the DNA is made up of the same letters as coding DNA but it doesn't have the same meaning.
Quite simply, we don't know what some of our genome does. The bits of DNA we don't understand have often been called 'junk DNA'. However, the more we learn about what's in the 'junk', the more it seems better to call it 'noncoding DNA' instead.
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