Downregulation of S100 Calcium Binding Protein A9 in Esophageal Squamous Cell Carcinoma

Figure 1

Protein sequence of S100 calcium binding protein A9 and the representative MS/MS spectra of peptides from S100 calcium binding protein A9. (a) Protein sequence of S100A9 and the peptides (in black) mapping to S100A9 protein identified in our ESCC tissue proteomics study. (b) MS/MS spectra of peptides mapping to S100A9 protein identified in ESCC tissue proteomics study. The inset shows reporter tags reflecting relatively higher expression in normal esophageal epithelia (114 and 115 reporter tags) as compared to ESCC tissue (116 and 117 reporter ions).

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