Transfection Reagent I is used in large unilamellar cationic vesicles (LUVs) preparation and lipoplex generation. It improves transfection efficiency. DOTAP/DOPE (1,2-dioleoyloxypropyl)-N,N,N-trimethylammonium chloride /(1,2-dioleoyl-sn-glycero-3-phosphoethanolamine) is safe transfection agent for human administration. It inhibits the blood vessel thickening and is a promising candidate for use in coronary artery bypass grafting (CABG).