Abbreviations: AAP: Amino Acid Permeases; LHT: Lysine and Histidine Transporters; ProT: Proline Transporters; GAT: GABA Transporters; AUX: Auxin Transporters; ATL: Amino Acid Transporter-Like; ANT: Aromatic and Neutral Amino Acid Transporters

Figure 2: Phylogenetic tree of AAAP genes in maize, rice and Arabidopsis thaliana. The unrooted tree was generated using the MEGA v4.0 program with the neighbor-joining method.