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PA composition and the log concentration (µg/g) of the major plant parts (root, stem, leaf and flowers) in (A). H. europaeum (n = 5), (B) H. rotundifolium (n = 5) and (C) H. suaveolens (n = 5). *: tentative identification. Concentrations are for the sum of tertiary amines and corresponding N-oxides.
