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letter
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lethal mutation
le·thal mu·ta·tion (plural le·thal mu·ta·tions)


noun 
Definition:
 
genetic mutation that kills cells: a genetic mutation with an effect so serious that it often results in the death of the organism concerned
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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