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B. epigenetic modificationEpigenetic modification is defined as the modifications that lead to alternative gene expression without changes in the sequence of the nucleic acid itself. The other choices are incorrect, though "alternative splicing" is a tempting option. This also leads to changes in gene production, but derives from splicing out of different regions of the DNA sequence itself and rejoining it to other sections. Epigenetics does not rely on any sequence changes at all
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