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Generic representation of N-capping motif of class B GPCRs peptide ligands. The N-capping motif (type IA) is represented as (1) the hydrophobic interactions between side-chain groups of N′ and N3 residues (dashed lines); (2) the hydrogen bond between side chain of Ncap residue and backbone atom of N3 residue. See Neumann et al. (2008) for details.
