Figure 6: Recombinant protein production systems in transgenic silkworms. (a) Vector using the fibroin L chain gene. (b) Vectors using the GAL4/UAS binary gene expression system. (c) FHX gene expression vector. (d) Vector using the fibroin H chain gene. (e) Vector using the sericin 1 gene promoter, BmNPV ie1 gene, and hr3 enhancer.