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 1: Phylogenetic tree showing the evolutionary relationships of the maize AAAP genes. The phylogenetic tree was generated using the neighbor-joining method as implemented in the MEGA v4.0 program.