DSP and infection: Surprisingly, while significant amounts of mature DSP430 and PP240 were generated by incubation of the CM0–3d sample, little, if any cleavage of DSP-PP240 occurred in the CM3–7d sample on extended incubation, suggesting that a processing enzyme secreted by Sf9 cells within the first 3 days after infection, was no longer secreted after the first three days.