Expression Systems LLC ESF 921  Insect Cell Culture Media is designed for maximum virus and protein expression. This serum-free, protein-free insect cell culture medium provides excellent cell growth for a wide range of insect cells including Spodoptera frugiperda (Sf9, Sf21), Trichoplusia ni (T.ni or Hi5) and Drosophila S2. ESF 921  Insect Cell Culture Medium enables maximum expression for applications such as gene therapy drug substance, virus-like particles, virus vectors and proteins of interest.