Fig. 4
From: Histopathological findings in a COVID-19 patient affected by ischemic gangrenous cholecystitis
Immunohistochemical images relative to (1) over endothelial cells expression with anti-CD31 antibody (dark brown) in a (magnification × 2/0.08 NA) and in b (magnification × 10/0.40 NA); (2) tissue macrophages with anti-CD68 antibody (brown) in c (magnification × 2/0.08 NA) and in d (magnification × 10/0.40 NA); and (3) tissue lymphocytes CD4+ (helper) with anti-CD4 antibody (brown) in e (magnification × 2/0.08 NA) and in f (magnification × 10/0.40 NA)