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Although wortmannin is extensively used in molecular signaling studies, its stability in tissue culture medium has not been assessed precisely. Therefore, we used high-performance liquid chromatography (HPLC) and mass spectrometry (MS) to characterize the decomposition of wortmannin in five commonly used media. Wortmannin was added to medium alone or to medium supplemented with 10% unheated or heat-inactivated...
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