After small regulatory RNAs are transcribed and processed, specialized enzymes cleave the RNAs to double-stranded fragments that are typically around 20-25 nucleotides long.

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Small regulatory RNAs, such as microRNAs and siRNAs, are typically processed by specialized enzymes that cleave them into double-stranded fragments that are typically around 20-25 nucleotides long.

After Small Regulatory RNAs Are Transcribed and Processed, Specialized Enzymes