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(a) VCD spectra for L1, L25, L50, L75, and L100 with Trp6 and Pro18 both isotopically labeled. (b) Isotope-labeled region of the vibrational circular dichroism spectra with Trp6 and Pro18 both labeled. (c) Isotope-labeled region of the VCD spectra with only Trp6 labeled. (d) Isotope-labeled region of the VCD spectra with only Pro18 labeled
