FMO5 and COVID-19: We showed that COVID-19 patient–derived EVs or viral spike protein triggered-pEVs that carried GU-enriched miRNAs (e.g., miR-21/let-7b) interacted with TLR7/8 to induce p47phox phosphorylation, activate NADPH oxidase and thus promote ROS production in neutrophils to enhance NETs formation.