A protein complex facilitating transport of molecules (proteins, small molecules, nucleic acids) into, out of or within a cell, or between cells. [ GOC:bhm http://www.ncbi.nlm.nih.gov/pubmed/15449578 ]
This is just here as a test because I lose it
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An example of this is GTR1 in human (UniProt symbol P11166) in PMID:15449578 (inferred from direct assay).