Nomenclature	B0AT1	B0AT2	B0AT3	NTT5	NTT4	SIT1
Systematic nomenclature	SLC6A19	SLC6A15	SLC6A18	SLC6A16	SLC6A17	SLC6A20
HGNC, UniProt	SLC6A19, Q695T7	SLC6A15, Q9H2J7	SLC6A18, Q96N87	SLC6A16, Q9GZN6	SLC6A17, Q9H1V8	SLC6A20, Q9NP91
Endogenous substrates	L-leucine, L-methionine, L-isoleucine, L-valine > L-asparagine, L-phenylalanine, L-alanine, L-serine > L-threonine, glycine, L-proline 152	L-proline > L-alanine, L-valine, L-methionine, L-leucine > L-isoleucine, L-threonine, L-asparagine, L-serine, L-phenylalanine > glycine 152	L-alanine, glycine > L-methionine, L-phenylalanine, L-leucine, L-histidine, L-glutamine 203	–	L-leucine, L-methionine, L-proline > L-cysteine, L-alanine, L-glutamine, L-serine > L-histidine, glycine 209	L-proline
Stoichiometry	1 Na+: 1 amino acid 154	1 Na+: 1 amino acid 151	Na+- and Cl- -dependent transport 193	–	Na+-dependent, Cl--independent transport 209	2 Na+: 1 Cl-: 1 imino acid 150
Comment	Mutations in B0AT1 are associated with Hartnup disorder	–	–	–	–	–