NOX4 and COVID-19: Jiang et al. analyzed the cardiac microvascular endothelial levels of NADPH oxidase 2 (NOX2), NADPH oxidase 4 (NOX4), NADPH oxidase 5 (NOX5), and Nitrotyrosine (NT) in COVID-19 patients, finding out the induction of the oxidative stress-associated enzymes NOX2 and NOX5 in the cardiac endothelium of the cases [24].