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BACKGROUND
Field‐evolved resistance of Helicoverpa zea to Bacillus thuringiensis (Bt) toxin Cry1Ac was first reported more than a decade ago, yet the underlying mechanisms remain elusive. Towards understanding the mechanisms of resistance to Cry1Ac, we analyzed a susceptible (LAB‐S) and two resistant (GA and GA‐R) strains of H. zea. The GA strain was derived from Georgia and exposed to Bt toxins...
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