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Toxicity of insecticidal endotoxins produced by Bacillus thuringiensis correlates with the presence of specific proteins in the midgut of susceptible larvae. This study was aimed at identifying and purifying Cry 1A binding proteins from Helicoverpa armigera, an important crop pest of India. B. thuringiensis strain HD 73 which produces Cry 1Ac toxin, specific for H. armigera was used in this study...
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