80295-50-7 80295-52-9 A3ULP0F556 Antibodies, Monoclonal, Humanized Biomarkers COVID-19 Case Reports Complement Complement C4b Complement C5 Complement Inactivating Agents Complement Membrane Attack Complex Coronavirus EC 3.4.21.- Eculizumab Fibrin Fibrinogen Degradation Products Journal Article Lectin pathway MASP2 MASP2 protein, human Mannose-Binding Protein-Associated Serine Proteases Peptide Fragments Research Support, Non-U.S. Gov't complement C4d eculizumab fibrin fragment D