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TCID	Name	Domain	Kingdom/Phylum	Protein(s)
9.A.74.1.1	Heteromeric nitrate/nitrite transporter of two subunits, NrtS1 and NrtS2, of 92 and 84 aas, both with 2 TMSs. Probably forms a homohexameric transporter with a K_m for nitrate of 0.5 mM, but the individual subunits have a K_m of >3 mM (Maeda et al. 2019).	Bacteria	Cyanobacteriota	NrtS1/NrtS2 of Synechococcus sp.
9.A.74.1.2	NrtS homologue of 72 aas and 2 TMSs, shown to transport nitrate with a K_m of 0.5 mM (Maeda et al. 2019).	Bacteria	Pseudomonadota	NrtS of Marinomonas mediterranea
9.A.74.1.3	NrtS homologue of 96 aas and 2 TMSs (Maeda et al. 2019).	Bacteria	Actinomycetota	NrtS of Mycobacterium tuberculosis
9.A.74.1.4	Uncharacterized NrtS homologue of 118 aas and 2 TMSs	Archaea	Candidatus Thermoplasmatota	UP of marine Group II euryarchaeote
9.A.74.1.5	Uncharacterized protein of 74 aas and 2 TMSs.	Bacteria	Planctomycetota	UP of Rhodopirellula islandica
9.A.74.1.6	Uncharacterized protein of 345 aas and 2 N-terminal TMSs where the 2 TMSs are homologous to NrtS homologues and the hydropilic extention is homologous to methylated chemotaxis proteins (MCPs). Other proteins in the NCBI protein database have the same domain structure.	Bacteria	Pseudomonadota	UP of Psychromonas ossibalaenae
9.A.74.1.7	Uncharacterized protein of 85 aas and 2 TMSs.	Bacteria	Verrucomicrobiota	UP of Lacunisphaera limnophila
9.A.74.1.8	Uncharacterized protein with an N-terminal 2 TMSs homologous to NrtS and a C-terminal hydrophilic domain annotated as a class I SAM-dependent methyltransferase.	Bacteria	Actinomycetota	UP of Amycolatopsis palatopharyngis
9.A.74.1.10	Uncharacterized protein of 81 aas and 2 TMSs.	Bacteria	Pseudomonadota	UP of Rhodanobacter denitrificans
9.A.74.1.11	Uncharacterized protein of 92 aas and 2 TMSs	Bacteria	Actinomycetota	UP of Mycobacterium tuberculosis
9.A.74.1.12	Uncharacterized protein of 96 aas and 2 probable TMSs	Bacteria	Pseudomonadota	UP of Methyloprofundus sedimenti