| Status | Description | Organism | Genes | References |
|---|---|---|---|---|
| spermidine synthase | Acetobacter aceti | G10B5-485 | ||
| spermidine synthase | Alicyclobacillus acidocaldarius | GCIO-1745 | ||
| spermidine synthase | Alicyclobacillus acidocaldarius | GCIO-2818 | ||
| spermidine synthase | Aquifex aeolicus | speE | ||
| spermidine synthase | Aquifex aeolicus | GJBH-949 | ||
| spermidine synthase | Alishewanella aestuarii | G10GE-427 | ||
| spermidine synthase | Alishewanella agri | G10HS-2010 | ||
| spermidine synthase | Aromatoleum aromaticum | speE | ||
| spermine/spermidine synthase family protein 1 | Achromobacter arsenitoxydans | G10BD-3615 | ||
| spermidine synthase | Achromobacter arsenitoxydans | G10BD-1383 |