Photomicrographs (IMAGE) Cold Spring Harbor Laboratory Caption Photomicrographs of human lung tissue taken from a patient who died of COVID-19. These are examples of the Neutrophil Extracellular Trap (NET) structures associated with small blood clots. Small blood vessels are outlined with yellow dotted lines, and NETs are identified by the presence of neutrophils (in gray), altered DNA-associated proteins (green). Platelets in the blood clots are in red. Blue color stains DNA in all cells Credit Xue-Yan He and David Ng, Egeblad Lab/CSHL, 2020 Usage Restrictions Attribution needed License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.