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Principle pathway of polyamine biosynthesis in plants. Expression of all genes encoding enzymes of the pathway were investigated except for agmatine deaminase, carbamoylputrescine amidase and spermine synthase. Metabolites measured in this study included arginine, putrescine, spermine and spermidine. Metabolites indicated by an asterisk were previously shown to have in vitro trichothecene inducing activity [18].
