Accumulated SEAP expression of Sf9/pIBdsCasp-1 and Sf9/pIBdsCasp-2 cells. Cells (Sf9, Sf9/pIB, Sf9/pIBdsCasp-1 and Sf9/pIBdsCasp-2) were infected with rBacSEAP at MOIs of 0.1 (A), 1 (B), 10 (C) and 100 (D). At each day post-infection, culture media were analyzed for relative specific SEAP activity. Data is presented as the mean ± S.D. of two independent experiments, and statistically analyzed using the Student’s t-test. *p < 0.05, compared to corresponding controls.