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The N‐capping box is a well‐known helix‐stabilizing motif with a distinct reciprocal backbone–side chain hydrogen‐bonding arrangement at the N‐terminus of helices. This unique N‐terminal flanking motif consists of a hydrogen‐bonded cycle of four amino acid residues in which the backbone amide of the N3 residue forms a hydrogen bond with the side chain of the Ncap residue, and reciprocally, the side...
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