Table 1 Major diamines and polyamines present in plants and humans

Name	Plants	Humans
Putrescine	✓	✓
Cadaverine	✓*	✗
Spermidine	✓	✓
Spermine	✓	✓
Thermospermine	✓	✗
Agmatine	✓	✓*

The sign “✓” denotes that a compound is present in a plant or human organism, and the mark “✗” denotes that it is not present. Cadaverine and thermospermine are not present in the human organism, only in plants. *Cadaverine is not found in all plants, only in legumes and some other families¹⁴⁴. Agmatine is not synthesised in human cells, but it is synthesised by gut bacteria, so it can be found in human organism¹².
**It should be noted that at physiological pH values, the nitrogen atoms in these structures would be predominantly protonated.

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