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353126
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Three polyamines - putrescine, spermine, and spermidine - ar...
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Summation
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Three polyamines - putrescine, spermine, and spermidine - are derived from ornithine by decarboxylation and condensation reactions. Arginine is metabolised similarly to form a fourth polyamine, agmatine. Polyamine levels are tightly regulated at the level of the enzyme ornithine decarboxylase (ODC) (Hillary and Pegg 2003; Moinard et al. 2005; Urdiales et al. 2001).