title: Electron microscopy of the first component of human complement.
mesh_terms: D000595:Amino Acid Sequence; D055598:Chemical Phenomena; D002621:Chemistry; D003166:Complement Activating Enzymes; D003167:Complement Activation; D003172:Complement C1 / Q000276:immunology; D015922:Complement C1q; D015923:Complement C1r; D003173:Complement C1s; D003171:Complement Pathway, Classical; D006801:Humans; D046911:Macromolecular Substances; D008433:Mathematics; D008854:Microscopy, Electron; D008970:Molecular Weight
chemical_list: D003172:Complement C1; D046911:Macromolecular Substances; D015922:Complement C1q; D003166:Complement Activating Enzymes; D015923:Complement C1r; D003173:Complement C1s