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KAI2b proteins in lettuce and E. penduliflora have enlarged ligand-binding pockets. Homology models of (A) LsKAI2a, (B) LsKAI2b, (C) EpKAI2a, and (D) EpKAI2b. Hydrophobic cavities and their volumes are shown. Pocket residues that differ between KAI2a and KAI2b in each species are indicated.
