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Residue 5 [the substitution site in the (Ala)9 peptide of Fig. 1] is made to undergo a transition from extended β (–120°, 120°) to approximately PPII (–70°, 150°) in steps of 10° in φ and 6° in ψ. The value of ESF (in kcal/mol) at residue 5 is plotted against φ for the substituted residue, Ala or Val.
