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Structure of the model peptide and of the residues incorporated at the guest position. (A) Cartoon representation of the structure of the P2A peptide in the presence of La3+ [Protein Data Bank (PDB) ID code 1NKF, ref. 24]. The side chain of Ala-14 is shown as a green sphere. (B) Ball-and-stick models of the amino acid residues that were used in this study.
