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MALDI-ToF mass spectra of a gargle sample from a COVID-19 negative donor (
) and an overlay of two COVID-19 positive donors (
, 
). Panel A is the full-range mass spectra of the samples. Panels B and C are specific ranges where differences in mass spectra are prominently observable between COVID-19 positive and COVID-19 negative samples. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
