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(a) Raman spectra of the investigated Omicron subvariants (cf. labels in the inset) in the spectral zone between 750 and 900 cm–1 and (b) tyrosine doublet, also referred to as the Fermi doublet, is extracted and colored according to the pH scale in the inset together with the respective RF ratios. The wavenumbers given in the inset are in units of cm–1 and the abbreviations are defined in the text.
