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Elevated serum XBP1(S) in human SARS-CoV-2 infection. (A+B) XBP1(S) was measured in serum from normal healthy controls or patients with COVID- 19 by western blot. (A) The image shows representative samples. (B) Relative quantification. Means + SD, n = 8. **P < 0.001 by Mann–Whitney U test.
