| Domain | Name | Category | Type | 
		| IPR001045 | Spermidine/spermine synthases | Family | Family | 
		| IPR029063 | S-adenosyl-L-methionine-dependent methyltransferase | Family | Homologous superfamily | 
		| IPR030373 | Polyamine biosynthesis domain, conserved site | Site | Conserved site | 
		| IPR030374 | Polyamine biosynthesis  domain | Domain | Domain | 
		| IPR030668 | Spermidine/spermine synthase, eukaryotes | Family | Family | 
		| IPR035246 | Spermidine synthase, tetramerisation domain | Domain | Domain | 
		| IPR037163 | Spermidine synthase, tetramerisation domain superfamily | Family | Homologous superfamily |