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NMR structure of VIP and representation of N-capping motif. Middle gray ribbon represents the average conformation of VIP structure. In magnified inset the N-capping motif 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 N-cap residue and backbone atom of N3 residue. See ref. Neumann et al. (2008) for details.
