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Phylogenetic tree of the ABC1 protein families in P. trichocarpa and rice. The tree was generated using the MEGA5 program with the neighbor-joining method. Pink represents group Ia, blue represents group Ib, green represents group II, and gray represents group III. OsABC1P represents ABC1 proteins in rice, while PtrABC1P represents ABC1 proteins in P. trichocarpa.
