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TCID	Name	Organismal Type	Example
2.A.67.1.1	Oligopeptide transporter, OPT1	Yeast	OPT1 of Candida albicans
2.A.67.1.2	Sexual differentiation process, ISP4 protein (tetra peptide transporter)	Yeast	ISP4 of Schizosaccharomyces pombe
2.A.67.1.3	The YJL212c gene protein (oligopeptide transporter, Opt1p; transports the mammalian pentapeptide, enkephalin, and the tripeptide, glutathione)	Yeast	Opt1p (YJL212c) of Saccharomyces cerevisiae
2.A.67.1.4	The YPR194c gene protein (oligopeptide transporter, Opt2p)	Yeast	Opt2p (YPR194c) of Saccharomyces cerevisiae
2.A.67.1.5	The glutathione (tripeptide) uptake transporter, Opt1 or Pgt1 (Dworeck et al., 2009). Transports γ-Glu-Cys-Gly and Glu-Cys-Gly (Thakur et al., 2008). Mutations in the N-terminus allow functional expression in S. cerevisiae (Thakur and Bachhawat 2013).	Yeast	Opt1 of Schizosaccharomyces pombe (O14031)
2.A.67.1.6	Tetra or penta oligopeptide uptake transporter OPT9 (highly expressed in microspores and bipolar pollen; Bock et al., 2006)	Plants	OPT9 of Arabidopsis thaliana (Q9FJD2)
2.A.67.1.7	High affinity glutathione uptake porter Hgt1p or OPT2. TMS 9 plays a role in glutathione recognition (Thakur & Bachhawat et al., 2010).	Yeast	Hgt1p of Saccharomyces cerevisiae (Q06593)
2.A.67.2.1	'Yellow Stripe1' (YS1) Fe³⁺-phyto siderophore:H⁺ symporter. It takes up various metal cations (Fe³⁺, Zn²⁺, Cu²⁺, Ni²⁺, Mn²⁺ and Cd²⁺ when complexed with phytosiderophores, and Ni²⁺, Fe²⁺ and Fe³⁺ when complexed with nicotinamine) (Curie et al., 2001; Schaaf et al., 2004)	Plants	YS1 of Zea mays
2.A.67.2.2	The probable metal (iron, copper, and zinc) nicotinamide transporter, YSL1 (Waters et al., 2006) (57% identity with YS1).	Plants	YSL1 of Arabidopsis thaliana (Q6R3L0)
2.A.67.2.3	The metal (iron and copper)-nicotinamide transporter, YSL2 (mediates lateral movement of metals in the vasculature; DiDonato et al., 2004) (62% identity with YS1).	Plants	YSL2 of Arabidopsis thaliana (Q6R3K9)
2.A.67.2.4	The probable metal (iron, copper, and zinc)-nicotinamide transporter, YSL3; functionally redundant with YSL1 (Waters et al., 2006).	Plants	YSL3 of Arabidopsis thaliana (Q2EF88)
2.A.67.2.5	The rice iron(III)-deoxymugineic acid transporter, YSL18 (specifically expressed in reproductive organs and phloem of lamina joints) (Aoyama et al., 2009).	Plants	YSL18 of Oryza sativa (Q941V3)
2.A.67.2.6	OPT family member	Slime mold	OPT family homologue of Dictyostelium discoideum (Q54EF1)
2.A.67.2.7	Putative oligopeptide transporter YGL114W	Fungi	YGL114W of Saccharomyces cerevisiae
2.A.67.2.8	The metal-phytosiderophore complex transporter, HvYSL2 (Araki et al. 2011).	Plants	HvYSL2 of Hordeum vulgare
2.A.67.2.9	Yellow stripe-like 7 protein, YSL7; expression gives rise to heavy metal tolerance in Brassica juncea (Wang et al. 2013).	Plants	YSL7 in Arabidopsis thaliana
2.A.67.3.1	Early sporulation protein, EspB (temporal control protein)	Bacteria	EspB of Myxococcus xanthus
2.A.67.4.1	Orf HI0561/560	Bacteria	Orf of Haemophilus influenzae
2.A.67.4.2	OPT family member	Archaea	OPT family member from Pyrococcus horikoshii (O58099)
2.A.67.4.3	OPT family member	Bacteria	OPT protein of Caulobacter crescentus (Q9A523)
2.A.67.5.1	Putative oligopeptide transporter	Proteobacteria	Putative oligopeptide transporter of Myxococcus xanthus