Evidence that siRNAs function as guides, not primers, in the Drosophila and human RNAi pathways.
Schwarz DS, Hutv?gner G, Haley B, Zamore PD. Evidence that siRNAs function as guides, not primers, in the Drosophila and human RNAi pathways. Mol Cell. 2002 Sep; 10(3):537-48.