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RNA interference (RNAi) is a cellular mechanism that regulates gene expression post-transcriptionally by degrading specific messenger RNA (mRNA) molecules or inhibiting their translation. The process begins when double-stranded RNA (dsRNA) enters the cell, either endogenously or through experimental introduction. The enzyme Dicer recognizes and cleaves dsRNA into small interfering RNAs (siRNAs) of about 21–23 nucleotides. These siRNAs are then ____ _________ ____ ________ ______ ___ _____.
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