BACKGROUND &OBJECTIVE: RNA interference (RNAi) is a new gene block ing technology that silences target gene at post-transcription level induced by the small interference RNA (siRNA). RNAi has been demonstrated great prospect i n gene functional research and gene therapy areas. Nowadays, RNAi has been repor ted to be used to inhibit the expression of endogenous genes including cyclophil in, GAPDH, p53, and c-myc; and there were some progresses in the therapy of the diseases caused by AIDS and hepatitis virus...