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RNA interference (RNAi) is a conserved biological mechanism that regulates gene expression by silencing specific messenger RNA (mRNA) molecules in a sequence-specific manner. It is triggered by double-stranded RNA (dsRNA), which may originate from endogenous sources such as microRNAs (miRNAs) or exogenous _____ ____ _______ ___ ________ _________ __________ __________ ____.
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