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Bacillus thuringiensis (Bt) insecticidal crystal (Cry) proteins are effective against some insect pests in sprays and transgenic crops, although the evolution of resistance could threaten the long-term efficacy of such Bt use. One strategy to delay resistance to Bt crops is to ''pyramid'' two or more Bt proteins that bind to distinct receptor proteins within the insect midgut. The most common Bt pyramid...
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