Fig. 2.

Immunofluorescent staining of NOXes and CD31 in the cardiac microvasculature of COVID-19 patients.

Shown are examples of immunofluorescent double staining for NOX2 + CD31 (the top row) and NOX5 + CD31 (the bottom row) in the cardiac microvasculature in the LV of COVID-19 patients. The white arrows indicate blood vessels with NOXes-positive and CD31-positive endothelium. NOXes were stained as green as shown in the first column. CD31 was stained as red as shown in the second column, the nucleic acid was stained as blue in the third column. The images shown in the fourth column are the merge of NOXes, CD31and nucleic acids. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)