National Cancer Institute
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Science Behind the News Understanding Cancer
 
Four diagrams of one strand of DNA.

DNA Mutation

Genes can be mutated in several different ways. The simplest type of mutation involves a change in a single base along the base sequence of a particular geneómuch like a typographical error in a word that has been misspelled. In other cases, one or more bases may be added or deleted. And sometimes, large segments of a DNA molecule are accidentally repeated, deleted, or moved.



 
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