title: Hypothesis. Bound C3 as the second signal for B-cell activation.
mesh_terms: D000917:Antibody Formation; D000936:Antigen-Antibody Complex; D001402:B-Lymphocytes / Q000276:immunology*; D001666:Binding Sites, Antibody; D002462:Cell Membrane / Q000276:immunology; D003168:Complement Fixation Tests; D003165:Complement System Proteins; D000939:Epitopes; D007075:Immunoglobulin M; D010587:Phagocytosis; D013601:T-Lymphocytes / Q000276:immunology; D013950:Thymus Gland / Q000276:immunology
chemical_list: D000936:Antigen-Antibody Complex; D000939:Epitopes; D007075:Immunoglobulin M; D003165:Complement System Proteins