transversion

noun
trans·ver·sion | \tran(t)s-ˈvər-zhən, tranz- \

Medical Definition of transversion 

1 : the eruption of a tooth in an abnormal position on the jaw

2 : a genetic mutation in RNA or DNA that results from the substitution of a purine base for a pyrimidine base or of a pyrimidine base for a purine base

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not any or not one

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