Cloned from the parent cell line, IPLB-SF-21-AE, derived from pupal ovarian tissue of the fall armyworm (species Spodoptera frugiperda, family Noctuidae, order Lepidoptera); cells are susceptible to infection with MNPV and other Baculoviruses. The Sf9 cell line is a suitable host for the expression of recombinant proteins using baculovirus expression vectors.