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Mutations affecting proteins

Very occasionally, a DNA mutation occurs in a gene, changing its RNA molecule and sometimes affecting the protein it codes for. The RNA code uses four chemical 'letters' (bases), known as A, C, U, and G, in groups of three. Adding, removing or changing just one base can have a drastic effect on a gene, just as changing one letter in a sentence of three-letter words can alter its meaning.

The RNA code.

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