| Q8II73 | n/a | 2pt9 | 2MH | A | 401 | e2pt9A2 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |
| Q8II73 | n/a | 2pt9 | 2MH | A | 401 | e2pt9A3 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| Q8II73 | n/a | 2pt9 | 2MH | B | 402 | e2pt9B2 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |
| Q8II73 | n/a | 2pt9 | 2MH | B | 402 | e2pt9B3 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| Q8II73 | n/a | 2pt9 | 2MH | C | 403 | e2pt9C2 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |
| Q8II73 | n/a | 2pt9 | 2MH | C | 403 | e2pt9C3 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |