Fig. 2.

Insect bioassays. Effects of BtRB fusion protein on mean survival and development of stem borer (C. suppressalis) in transgenic maize (a) and rice (b) plants. WT (WT nontransformed plants) were used as negative controls; plants expressing Cry1Ac toxin and RB were used to determine the enhancement in toxicity provided by the fusion protein. BtRB, Cry1Ac/RB fusion protein. Differences between BtRB and other treatments in both assays are significant at P < 0.05; other differences are not significant. (Scale bar, 2 mm.)