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Detection and determination of mycotoxins by LC-MS-MS, e.g. comparative levels of fumonisins B1 and B2 within isogenic non-Bt (A, B) and Bt maize (C, D) harvested samples. For fumonisin B1, we observed 4 × 106 cps value in isogenic non-Bt maize (Fig. 2, A) versus 6000 cps in Bt maize (Fig. 2, C). For fumonisin B2, 6 × 105 cps were noted in isogenic non-Bt maize (Fig. 2, B) versus 1240 cps recorded in Bt maize (Fig. 2, D).