Figure 5.

(a) Raman spectra of the investigated Omicron subvariants (cf. labels in the inset) in the spectral zone between 1600 and 1750 cm^–1, which contain the Amide I region (cf. labels in the inset) and (b) deconvoluted Raman signals from different protein secondary structures are extracted from the respective subvariant spectra and replotted with different colors to emphasize their differences (α-helix, αh; β-sheet, βs; random coil, rc; and β-turn rotamers, βt types I and II). Fractional intensities for different protein secondary structures are listed in the inset together with the respective R_rc ratios. The wavenumbers given in the inset are in units of cm^–1 and the abbreviations are defined in the text.