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back-formation
back forty
back four
back issue
back kitchen
back line
back matter
back month
back mutation
back number
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back off
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back mutation
back mu·ta·tion (plural back mu·ta·tions)


noun 
Definition:
 
reversion of gene to original form: the reversion of a mutated gene to its original form
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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