In the comic-book lore, of course, you mutate post a traumatic event. You must have the mutant gene, but if something traumatic happens to you, usually at puberty, then that mutation manifests itself.
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Mutations can arise anywhere in the genome, in gene DNA and noncoding DNA alike. But mutations to genes have bigger consequences: They can disable proteins and kill a creature.
Most mutations involve typos: Something bumps a cell's elbow as it's copying DNA, and the wrong letter appears in a triplet - CAG becomes CCG.
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