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(a) Raman spectra of the investigated Omicron subvariants (cf. labels in the inset) in the spectral zone between 900 and 1200 cm–1 and (b) fingerprint Raman signals of RNA purines and pyrimidines are extracted from the spectra and colored for better clarity. Fractional intensities are listed in the inset together with the respective Rpl ratios. The wavenumbers given in the inset are in units of cm–1 and the abbreviations are defined in the text.
