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Most δ-endotoxins produced by Bacillus thuringiensis require proteolytic processing in order to become active. The in vitro and in vivo activation processes of Cry39A, a δ-endotoxin that is highly toxic to Anopheles stephensi, were investigated. Cry39A with a molecular mass of 72kDa was processed in vitro into a 60kDa fragment by trypsin and gut extract from A. stephensi larvae. N-terminal amino acid...
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