Spermidine jẹ iru polyamine. Awọn polyamines jẹ kekere, ọra, polycationic (-NH3+) biomolecules. Awọn polyamines akọkọ mẹrin wa ninu awọn ẹran-ọsin: spermine, spermidine, putrescine ati cadaverine. Spermine jẹ ti awọn tetramines, spermidine jẹ ti awọn triamines, putresc ...
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