If your corn has a herbicide-tolerant gene, it means you can spray your herbicides and kill the weeds; you won't kill your corn because it's producing a gene that makes it tolerant of the herbicide.

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“If your corn has a herbicide-tolerant gene, it means you can spray your herbicides and kill the weeds; you won't kill your corn because it's producing a gene that makes it tolerant of the herbicide.”