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Catalysis of the high-affinity transfer of L-tryptophan from one side of a membrane to the other. Tryptophan is 2-amino-3-(1H-indol-3-yl)propanoic acid. In high-affinity transport the transporter is able to bind the solute even if it is only present at very low concentrations. [GOC:mtg_transport, ISBN:0815340729]
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