| Nomenclature | NTT5 | NTT4 | SIT1 |
| Systematic nomenclature | SLC6A16 | SLC6A17 | SLC6A20 |
| HGNC, UniProt | SLC6A16, Q9GZN6 | SLC6A17, Q9H1V8 | SLC6A20, Q9NP91 |
| Endogenous substrates | – | L‐leucine, L‐methionine, L‐proline>L‐cysteine, L‐alanine, L‐glutamine, L‐serine>L‐histidine, glycine [537] | – |
| Endogenous substrates | – | – | L‐proline |
| Stoichiometry | – | Na+‐dependent, Cl‐‐independent transport [537] | 2 Na+: 1 Cl‐: 1 imino acid [60] |
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