| Q8II73 | n/a | 6hy1 | GXQ | A | 401 | e6hy1A1 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| Q8II73 | n/a | 6hy1 | GXQ | A | 401 | e6hy1A2 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |
| Q8II73 | n/a | 6hy1 | GXQ | B | 401 | e6hy1B1 | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermidine synthase tetramerisation domain | Spermine_synt_N |
| Q8II73 | n/a | 6hy1 | GXQ | B | 401 | e6hy1B2 | Rossmann-like | Rossmann-related | S-adenosyl-L-methionine-dependent methyltransferases | Spermine_synth |