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Her work on the role of trichothecenes in the virulence of G. zeae has provided the foundation for other research programs in the United States , Canada , and Austria aimed at improving head blight resistance in wheat using genes that confer trichothecene resistance . The cells were cotransfected with a second plasmid vector to confer neomycin resistance and were selected in medium containing G418 . Unless specifically indicated , the plasmids confer ampicillin resistance .