Phylogenetic tree of the three rubber aquaporin ESTs with other plant species. The deduced amino acid sequences of three rubber aquaporin ESTs, pHbPIP1;1, pHbPIP2;1, and pHbTIP1;1, were compared with those from G. hirsutum (GhPIP1;1 [ABK60194] and GhTIP [ABR68795]), Medicago truncatula (MtPIP1;1 [AAK66766]), J. regia (JrPIP2;1 [AAO39007] and JrPIP2;2 [AAO39008]), and M. pudica (MpTIP1 [BAD90702]). Multiple sequence alignment was constructed by the VectorNTI Suite 6 software.