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. 2016 Jun 27;7:998. doi: 10.3389/fmicb.2016.00998

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Copyright © 2016 Tian, Zhang, Yang, Chen, Li, Chen, Yang, Li, Zhang, Zhang, Wu, Zhang, Long and Xiao.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) A streptomycete species tree and a heatmap showing the distribution of transport protein families. The transport protein families are described as follows: SSS, solute: sodium symporter; Nramp, metal ion (Mn²⁺-iron) transporter; TRAP-T, tripartite ATP-independent periplasmic transporter; BCCT, betaine/carnitine/choline transporter; Trk, K⁺ transporter; Tat, twin arginine targeting; MOP, multidrug/oligosaccharidyl-lipid/polysaccharide; NSS, neurotransmitter: sodium symporter; RhtB, resistance to homoserine/threonine; ArsB, arsenite-antimonite; ThrE, threonine/serine exporter; LIV-E, branched chain amino acid exporter; DAACS, dicarboxylate/amino acid: cation (Na⁺ or H⁺) symporter; LctP, lactate permease; MscL, large conductance mechanosensitive ion channel; Hsp70, cation channel-forming heat shock protein-70; GPTS, general phosphotransferase system; PiT, the inorganic phosphate transporter; ACR3, arsenical resistance-3; NhaA, Na⁺: H⁺ antiporter; DASS, divalent anion: Na⁺ symporter; AAE, aspartate: alanine exchanger; MerTP, mercuric ion (Hg²⁺) permease; NCS1, nucleobase: cation symporter-1; POT, proton-dependent oligopeptide transporter; MscS, small conductance mechanosensitive ion channel; Amt, ammonia transporter channel; TTT, tricarboxylate transporter; GntP, gluconate: H⁺ symporter; MIP, the major intrinsic protein; and NCS2, the nucleobase:cation symporter-2. (B) The gene tree of TRAP-T 2. (C) The gene tree of TRAP-T 3. (D) The gene tree of TRAP-T 4.