(a) Determination of the optimum nucleation macrocycle in HBS helices, (b) control peptide and HBS helices designed to determine the effect of nucleation macrocycle on the overall helicity, and (c) circular dichroism spectra of unconstrained peptide 8 (black) and HBS analogs 9 (red), 10 (green), 11 (pink), and 12 (blue). The CD spectra were obtained in 10% TFE-PBS.