Analytical standards including tomatidine (Sigma-Aldrich, contains dehydrotomatidine as impurity), α-tomatine (Carbosynth USA, contains dehydrotomatine as impurity), α-solamargine (ChemFaces) were dissolved in methanol at a concentration of 1 mg/ml. Hydroxytomatine used as substrate in recombinant assays during screening of BAHD candidates (Fig. 2b) was isolated and purified from leaves of GAME31-overexpressing transgenic tomato plants as described earlier11 (link).
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