| Nomenclature | Electrogenic sodium bicarbonate | Electrogenic sodium bicarbonate | Electroneutral sodium bicarbonate |
| cotransporter 1 | cotransporter 4 | cotransporter 1 | |
| Systematic nomenclature | SLC4A4 | SLC4A5 | SLC4A7 |
| Common abreviation | NBCe1 | NBCe2 | NBCn1 |
| HGNC, UniProt | SLC4A4, Q9Y6R1 | SLC4A5, Q9BY07 | SLC4A7, Q9Y6M7 |
| Endogenous substrates | NaHCO3‐ | NaHCO3‐ | NaHCO3‐ |
| Stoichiometry | 1 Na+ : 2/3 HCO3 ‐ (out) or 1 Na+ : CO3 2* | 1 Na+ : 2/3 HCO3 ‐ (out) or 1 Na+ : CO3 2* | 1 Na+ : 1 HCO3 ‐ (out) or 1 Na+ : CO3 2* |
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