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Decarboxylases involved in polyamine synthesis. (a) Pyridoxal phosphate (PLP)-dependent decarboxylases [L-1,4-diaminobutyric acid decarboxylase, L-ornithine decarboxylase (ODC), L-lysine decarboxylase and L-arginine decarboxylase]. (b) S-adenosylmethionine decarboxylase, which contains a covalently bound pyruvate group essential for activity.
