Our current study provides evidence that some microthrombi in COVID-19 consist almost entirely of citH3+, CD66b+, and CD15+ cells (Figures 2(d) and 2(e) and Figures 3(e), 3(f), 3(k), and 3(l)) and points to an instrumental role of strongly NETosis-prone LDNs in COVID-19 vascular clotting. The gene discussed is FUT4; the disease is COVID-19.