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The risk of insects evolving resistance to Bt transgenic crops is a major concern in agriculture. In Lepidoptera, one of the factors associated with resistance to Bt toxin is the cadherin Cry1A toxin receptor in the membranes of larval midgut cells. A cDNA encoding a putative Cry1A toxin receptor with high similarity to cadherin sequences identified in other Lepidoptera, was isolated from Sesamia nonagrioides (Lepidoptera: Noctuidae). Polymorphisms were identified in cadherin sequences from S.doi:10.5539/jas.v6n1p173 fatcat:ylqfmksi3zdjdbs224343uyrdi