Fibrin clots in lymphatic vessels in lungs of COVID-19 decedents. Representative immunofluorescence images of lung sections showing fibrin (green) and podoplanin⁺ LECs (red) with 488 autofluorescence (gray) to show tissue structure. Yellow arrows indicate clotted lymphatic vessels, and white arrows indicate damaged lymphatic endothelium. Scale bars, 100 μm.