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The process in which small interfering RNAs (siRNAs) direct the cleavage of target mRNAs. Once incorporated into a RNA-induced silencing complex (RISC), a siRNA will typically direct cleavage by base pairing with perfect or near-perfect complementarity to the target mRNA. [GOC:BHF, GOC:BHF_miRNA, GOC:rph, PMID:15260970]
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