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Polyamine metabolism in prokaryotic and eukaryotic cells. Enzymes: 1, arginase; 2, ornithine decarboxylase; 3, spermidine synthase; 4, spermidine/spermine acetyltransferase; 5, polyamine oxidase; 6, acetylpolyamine amidohydrolase; 7, spermine synthetase; 8, spermidine N8-acetyltransferase; 9, N8-acetylspermidine deacetylase.
