| Nomenclature | HGNC, UniProt | Other names |
| Smad1 | SMAD1, Q15797 | JV4-1, MADH1, MADR1 |
| Smad2 | SMAD2, Q15796 | JV18-1, MADH2, MADR2 |
| Smad3 | SMAD3, P84022 | HsT17436, JV15-2, MADH3 |
| Smad4 | SMAD4, Q13485 | DPC4, MADH4 |
| Smad5 | SMAD5, Q99717 | Dwfc, JV5-1, MADH5 |
| Smad6 | SMAD6, O43541 | HsT17432, MADH6, MADH7 |
| Smad7 | SMAD7, O15105 | MADH7, MADH8 |
| Smad8 | SMAD9, O15198 | MADH6, MADH9 |
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