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Flow chart of the ornithine pathway showing formation of polyamines and polyamine oxidation. Abbreviations: MDL, MDL-72,527 [N,N'-bis(2,3-butadienyl)-1,4-butanediamine]; ODC, ornithine decarboxylase; OAT, ornithine aminotransferase; SMO, spermine oxidase; APAO, N (1)-acetyl polyamine oxidase; SSAT, spermine spermidine acetyl transferase.
