Definition for RNA interference (RNAi)

RNA-induced silencing complex (RISC)

RNA polymerase

1) Refers to a type of mRNA silencing; miRNA interferes with the proper expression of an mRNA.

2) RNA interference (RNAi) is a regulatory mechanism of most eukaryotic cells that uses small double-stranded RNA (dsRNA) molecules as triggers to direct homology-dependent control of gene activity.