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TCID	Name	Domain	Kingdom/Phylum	Protein(s)
2.A.11.1.1	[Citrate or D-isocitrate]•M²⁺ (Mg²⁺ preferring):H⁺ symporter, CitM (transports Mg²⁺, Mn²⁺, Ni²⁺, Co²⁺ & Zn²⁺). Regulated by the CitS/CitT two component system (Yamamoto et al. 2000; Repizo et al. 2006).	Bacteria	Bacillota	CitM of Bacillus subtilis
2.A.11.1.2	[Citrate]•M²⁺ (Ca²⁺ preferring):H⁺ symporter, CitH (transports Ca²⁺, Ba²⁺ & Sr²⁺).	Bacteria	Bacillota	CitH of Bacillus subtilis
2.A.11.1.3	Citrate•Me²⁺ (Fe²⁺/Mn²⁺ preferring):H⁺ symporter, CitM	Bacteria	Bacillota	CitM of Streptococcus mutans (AAN58714)
2.A.11.1.4	Citrate-M²⁺ (Fe³⁺ preferring): H⁺ symporter, Cit (transports Fe³⁺, Ca²⁺, Pb²⁺, Ba²⁺ and Mn²⁺, but not Mg²⁺, Ni²⁺ or Co²⁺) (Lensbouer et al., 2008).	Bacteria	Actinomycetota	Cit of Streptomyces coelicolor (Q9S242)
2.A.11.1.5	Uncharacterized transporter YraO	Bacteria	Bacillota	YraO of Bacillus subtilis
2.A.11.1.6	Citrate-inducible divalent cation:citrate uptake transporter, CitH. Can use Ca²⁺ or Sr²⁺ but not Mg²⁺ as the cotransported cation; The CitAB two component sensor kinase/response regulator system mediates induction by citrate (Brocker et al. 2009).	Bacteria	Actinomycetota	CitH of Corynebacterium glutamicum
2.A.11.2.1	Putative transporter	Bacteria	Bacillota	Putative transporter of Leuconostoc mesenteroides (Q03YV5)
2.A.11.2.2	Uncharacterized protein of 429 aas	Bacteria	Spirochaetota	UP of Treponema lecithinolyticum
2.A.11.2.3	Uncharacterized protein of 447 aas	Bacteria	Actinomycetota	UP of Nocardiopsis dassonvillei (Actinomadura dassonvillei)