hypermutation

noun
hy·per·mu·ta·tion | \-myü-ˈtā-shən \

Medical Definition of hypermutation 

: the process of producing an unusually high number of mutations or changes During maturation, B cells use somatic hypermutation to increase their diversity.— Thomas A.Waldmann, Science, 21 June 1991 also : a mutation or change produced by hypermutation

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