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S- adenosylmethionine decarboxylase proenzyme Spermidine synthase 5'- methylthioadenosine/S- adenosylhomocysteine nucleosidase 5- Methylthioribose 5- Methylthioribose S- Adenosylmethionine H + CO 2 S- Adenosylmethioninamine Putrescine Spermidine H + 5'-S-methyl- 5'- thioadenosine H 2 O Adenine Pyruvic acid Magnesium
speD speE mtn 5- Methylthioribose 5- Methylthioribose S- Adenosylmethionine Hydrogen Ion Carbon dioxide S- Adenosylmethioninamine Putrescine Spermidine Hydrogen Ion 5'-S-methyl- 5'- thioadenosine Water Adenine