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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	Firmicutes	CitM of Bacillus subtilis
2.A.11.1.2	[Citrate]•M²⁺ (Ca²⁺ preferring):H⁺ symporter, CitH (transports Ca²⁺, Ba²⁺ & Sr²⁺).	Bacteria	Firmicutes	CitH of Bacillus subtilis
2.A.11.1.3	Citrate•Me²⁺ (Fe²⁺/Mn²⁺ preferring):H⁺ symporter, CitM	Bacteria	Firmicutes	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	Actinobacteria	Cit of Streptomyces coelicolor (Q9S242)
2.A.11.1.5	Uncharacterized transporter YraO	Bacteria	Firmicutes	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	Actinobacteria	CitH of Corynebacterium glutamicum
2.A.11.2.1	Putative transporter	Bacteria	Firmicutes	Putative transporter of Leuconostoc mesenteroides (Q03YV5)
2.A.11.2.2	Uncharacterized protein of 429 aas	Bacteria	Spirochaetes	UP of Treponema lecithinolyticum
2.A.11.2.3	Uncharacterized protein of 447 aas	Bacteria	Actinobacteria	UP of Nocardiopsis dassonvillei (Actinomadura dassonvillei)