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Normalized and deconvoluted Raman spectra collected in two different spectral intervals (i.e., 600–1800 and 2800–3200 cm–1) on (a) BA.1.18, (b) BA.2, (c) BA.4, (d) BA.5, (e) XE, and (f) BA.2.75 Omicron subvariants; the wavenumbers given in the inset are in units of cm–1. Phe, Tyr, Trp, Met, Arg, Asn, and Gln are abbreviations for phenylalanine, tyrosine, tryptophan, methionine, arginine, asparagine, and glutamine amino acid residues, respectively.
