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Transition state structures for the peptide bond formation between two glycine molecules: (A) uncatalyzed gas-phase process; (B) in the presence of the anatase (101) surface; (C,D) in the presence of the anatase (101) surface assisted by one and two water molecules, respectively; and (E) in the presence of the anatase (101) surface assisted by a third glycine molecule. Adapted from [172].
