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Toxin from two strains of Bacillus thuringiensis (Bt), AA 1-9 and HD-73, caused dose-dependent destruction of cultured midgut cells from Heliothis virescens larvae. HD-73 toxin was more effective although, at the doses used, not all cells were killed. After 2 days of exposure to 0.8 pg/μl AA 1-9 or 0.06 pg/μl HD-73, columnar and goblet cell numbers declined to ca 20% of controls. In contrast, stem...
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