Recombinant lentiviral vectors have been shown to be a powerful tool for stable gene transfer to both dividing and non-dividing cells in vitro and in vivo. Through years of experience with lentiviral vectors, scientists at ABM have developed our own proprietary Lentiviral expression vectors and pLenti-combo packaging mix that allow for rapid production of recombinant lentiviral vectors with titers up to 107IU/ml. iLenti™ RNAi Expression System allows for the efficient expression of any target siRNA through transfection or lentiviral infection of target cells. The system is based on an unique convergent promoter design for greater efficiency of target gene knockdown without the need of a hair-pin loop structure design commonly required for a single promoter vector.