The coding regions of wild Bacillus thuringiensis cry1Ie and cry1Ac gene were modified according to plant preferring codons. The modified crylle and crylAc gene were artificially synthesized. Modified crylle and crylAc gene were cloned into prokaryotic expression vector pET28b, to construct plasmid pETIe and pETAc. These two proteins' expression in E. coli BL21(DE3) were confirmed by SDS-PAGE analysis. Proteins purified were injected into rabbit to prepare polyclonal antibodies. Bioassays using c...