[Triple expansion diseases: a new mutational concept].

Abstract excerpt

The human genome, made of about 3 billion bases, encodes between 75 and 100,000 genes. However, most of the genome is made of non coding sequences, whose function is still unknown. When a base variation occurs in a DNA fragment, base change, deletion or insertion of one or several bases, a mutation or a polymorphism is generated depending whether this base change modifies or not the function of the encoded gene....

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