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Enhanced toxicity of Cry1Ab domain III mutants correlating with enhanced stability to midgut juice treatment. (A) SDS-PAGE of protoxins and toxins activated with trypsin or with midgut juice from Sf-IBT. M, size markers. (B) Kinetic analysis of the treatment of Cry1Ab and domain III mutant protoxins with midgut juice (MJ) from S. frugiperda (Sf-IBT) or M. sexta.
