Fig. 1.

GRP78 protein expression among the lung sections from patients with COVID-19 (upper panels) and non-COVID-19 controls (bottom panels; a, b, g, h at 20 × ; c, d, i, k, l at 200 × ; and e, f at 400 ×). Yellow arrows indicate pneumocytes and green arrows identify macrophages. (a, b) Representative overview histology images showing intense GRP78 expression in COVID-19 lung; (c–f) Moderate to strong positive pneumocytes and macrophages on higher magnification in COVID-19 lung; (g, h) overview histology showing lung from non-COVID-19 control group; (i–l) rare positive pneumocytes and weak to moderate positive macrophages on higher magnification in lung from non-COVID-19 controls