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Phylogenetic analysis of PIN family genes from G. hirsutum, G. arboreum, G. raimondii and A. thaliana. The phylogenetic tree was constructed using MEGA 5.0 with the neighbor-joining method. The origin of the PIN genes are indicated by colored circles as follows: G. hirsutum (red), G. arboretum (yellow), G. raimondii (green), and A. thaliana (black). Numbers on branches are bootstrap values calculated from 1000 replicates
