Figure 3: Synthesis and interconversion of polyamines. DAO, Diamine Oxydase; GABA, ɣ-aminobutyric acid; ODC, Ornithine Decarboxylase; PAO Polyamine Oxydase; SAM, Sadenosylmethionine; SAM-DC, S-adenosylmethionine decarboxylase; SAM-HC, S-adenosylmethionine homocysteamine (Elvira et al., 2007).