Fig. 2
From: Identification of SARS-CoV-2 biomarkers in saliva by transcriptomic and proteomics analysis
MS/MS spectra and amino acid sequence analysis of the tryptic peptide most frequently identified in saliva from COVID-19 positive individuals. Tryptic peptide derived from both isoforms of SARS-CoV-2 replicase polyproteins 1a (accession number: P0DTC1) and 1ab (accession number: P0DTD1). The amino acid sequence of the peptide is – SHnIALIWnVKDFmSLSEQLR –. Triply charged precursor ion indicated by the diamond shape; m/z = 840.438, z = 3. B). Matching b- and y- ion series are indicated in the upper right of each figure