| Nomenclature | Sodium-dependent vitamin C transporter 1 | Sodium-dependent vitamin C transporter 2 | Sodium-dependent vitamin C transporter 3 | Sodium-dependent nucleobase transporter |
| Systematic nomenclature | SLC23A1 | SLC23A2 | SLC23A3 | SLC23A4 |
| Common abbreviation | SVCT1 | SVCT2 | SVCT3 | SNBT1 |
| HGNC, UniProt | SLC23A1, Q9UHI7 | SLC23A2, Q9UGH3 | SLC23A3, Q6PIS1 | SLC23A4P, – |
| Endogenous substrates | L-ascorbic acid > D-ascorbic acid > dehydroascorbic acid 308 | L-ascorbic acid > D-ascorbic acid > dehydroascorbic acid 308 | – | uracil > thymine > guanine, hypoxanthine > xanthine, uridine 309 |
| Substrates | – | – | – | – |
| Inhibitors (pIC50) | phloretin 308 | – | – | 5-fluorouracil 309 |
| Radioligands (Kd) | [14C]ascorbic acid | [14C]ascorbic acid | – | – |
| Stoichiometry | 2 Na+: 1 ascorbic acid (in) 308 | 2 Na+: 1 ascorbic acid (in) 308 | – | 1 Na+: 1 uracil (in) 309 |
| Comment | – | – | SLC23A3 does not transport ascorbic acid and remains an orphan transporter. | SLC23A4/SNBT1 is found in rodents and non-human primates, but the sequence is truncated in the human genome and named as a pseudogene, SLC23A4P |
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