CANX and COVID-19: Only one of these phosphorylated peptides, SDAEEDGGTVsQEEEDRKPK, which was mapping to calnexin (CANX) S564-p, had decreased levels in the serum of COVID-19 patients (log2-FC = -0.227, p = 0.005, FDR q = 0.049, Figure S16).