Spermidine bụ ụdị polyamine. Polyamines bụ obere, abụba, polycationic (-NH3+) biomolecules. Enwere polyamines anọ dị na mammals: spermine, spermidine, putrescine na cadaverine. Spermine bụ nke tetramines, spermidine bụ nke triamines, putresc ...
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