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PolyQ-polyP peptide (Q15P11) arrayed as a PPII helix (ϕ = −75°, ψ = 150°). (A) Close-up view showing the side chains of Gln and Pro in similar conformations. (B and C) Full length of the peptide in side view and end-on view, respectively, showing the PPII helical conformation with “folded-over” side chains.
