The Vectalys Constitutive Lentiviral Reporter Vectors are prepackaged lentiviral particles expressing fluorescent protein genes for transducing mammalian cells. The expression of fluorescent protein genes is driven by an EF1α promoter. These VSV-G pseudotyped viruses are capable of infecting both dividing and non-dividing cells. The high purification level of these lentiviral particles allows transduction of primary cells and immortalized cell lines without inducing any toxicity to the cells, even at high multiplicity of infection (M.O.I.).