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Liquid chromatography tandem mas spectrometry chromatograms of selected transitions (weakest transition shown) of a a blank mussel extract, b a blank mussel extract spiked with OA, yessotoxin (YTX), AZA1, pectenotoxin-2 (PTX2) and 13-desmethyl spirolide-C (SPX1) at 0.5 times the permitted level and c the strongest transition for a blank mussel spiked with OA, YTX, AZA1, PTX2 and SPX1 at 0.5 times the permitted level
