Figure 3: Production of the firefly luciferase with or without secretion signal in hemocytes or hemolymph of pure-bred, F1 hybrid and three ways cross of BmNPV sensitive strains. The luciferase activity was expressed as RLU per µg cell protein. Larvae (day 2 of the 5th instar) of the silkworm lines indicated were infected with BmNPV/Polh-Luc (A) or BmNPV/6G30K-Luc expressing luciferase fused with silkworm secretory protein 30 kDa protein at its N-terminus (B) at the amount of 2 × 104 pfu per larva. Hemocytes and haemolymph were collected at 72 hpi and assayed for the luciferase activity.