Dendogram showing sequence comparisons of several known members of the PT family from different species. Analysis was performed using the CLUSTAL X method in MEGA (4.0) using Neighbor-Joining method (Tamura K et al., 2007). Accession numbers are as follows: AtOPT1, NP_200404.1 GI: 15241078; AtOPT2, NP_172464.1 GI15218331; AtOPT3, NP_567493.5 GI:240255930; AtOPT4, NP_201246.1 GI:15237689; AtOPT5, NP_194389.1 GI:15236800; AtOPT6, NP_194503.1 GI:15234254; AtOPT7, NP_192815.1 GI:15236912; AtOPT8, NP_564525.1 GI:18402162; AtOPT9, NP_200163.1 GI:15238761; AlOPT3, XP_002868139.1 GI:297800510; AtYSL1, NP_567694.2 GI:79484897; AtYSL2, NP_197826.2 GI:79518939; AtYSL3, NP_200167.2 GI:145359208; AtYSL4, NP_198916.2 GI:42568235; AtYSL5, NP_566584.1 GI:18401590; AtYSL6, NP_566806.1 GI:18405202; AtYSL7, NP_176750.1 GI:15218799; AtYSL8, NP_564525.1 GI:18402162; TcYSL1, ABB76761.1 GI:82468791; TcYSL2, ABB76762.1 GI:82468793; TcYSL3, ABB76763.1 GI:82468795; CaOPT1, AAB69628.1 GI:2367386; CaOPT3, ABD17824.1 GI:87045965; ScOPT1, NP_012323.1 GI:6322249; ZmGT, ACL82964.1 GI:220901863 BjGT1, CAD91127.1 GI:30722286.