* This reagent has two solutions: Solution A - 0.5 ml, Solution B - 1.0 ml The TransPass??? R2 Transfection Reagent is a two component non-liposomal reagent combination developed specifically for efficient transfection of siRNA in a variety of mammalian cell lines that include ???difficult to transfect cells such as primary cells, endothelial cells, lymphocytes, muscle cells, etc.