Translocates aromatic and neutral amino acids such as tyrosine, tryptophan, phenylalanine, histidine, proline, leucine, valine, glutamine, as well as arginine. Transports the auxins indole-3-acetic acid (IAA) and 2,4-dichlorophenoxyacetic acid (2,4-D). Ubiquitous (PubMed:27925655). Highly expressed in flowers and cauline leaves and at lower levels in stems, leaves and roots (PubMed:11299361). Belongs to the amino acid/polyamine transporter 2 family. Amino acid/auxin permease (AAAP) (TC 2.A.18.8) subfamily. Sequencing errors.