ESF 921™ Insect Cell Culture Medium is a complete serum-free, protein-free medium developed for robust cell growth, protein production and baculovirus vector production for a wide range of insect cells including Sf9, Sf21, Tni (High Five™), and Drosophila S2. ESF 921 contains L-Glutamine and Kolliphor® P188 (Pluronic F68).