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A <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si5.gif" overflow="scroll"><mml:mi>D</mml:mi><mml:mi>α</mml:mi><mml:mtext>6</mml:mtext></mml:math> knockout strain of Drosophila melanogaster confers a high level of resistance to spinosad