Mutually exclusive occurrence and metabolism of trigonelline and nicotinic acid arabinoside in plant cell cultures. - Willeke, ,U.,.; Heeger, ,V.,.; Meise, ,M.,.; Neuhann, ,H.,.; Schindelmeiser, ,I.,.; Vordemfelde, ,K.,.; and Barz, ,W.. (Phytochemistry, 1979)