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Examples of (A) nucleobase–amino acid π–π stacking interaction (PDB ID: 3QGB), (B) nucleobase–amino acid T-shaped interaction (PDB ID: 1R9F), (C) ribose–amino acid sugar–π interaction (PDB ID: 2R8S) and (D) ribose–amino acid sugar–π interaction (PDB ID: 1K8W).
