acronym for small interfering RNAs, a class of regulators of gene expression. They are generated from double-stranded RNA (dsRNA) precursors. There is also another class of small RNAs involved in gene expression present in cells, MicroRNA, based upon "Dicer".
a short, double-stranded piece of RNA with a unique chemical sequence, or tag, that allows it to combine specifically with a particular messenger RNA (mRNA) that shares the same tag
small interfering RNA. A short sequence of double-stranded RNA that interferes with gene expression and is a useful tool in understanding genes.