title: Structure and activation of the early components of complement.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000937:Antigen-Antibody Reactions; D003172:Complement C1 / Q000378:metabolism; D003175:Complement C2 / Q000378:metabolism; D003176:Complement C3 / Q000378:metabolism; D003181:Complement C4 / Q000378:metabolism; D003165:Complement System Proteins / Q000378:metabolism; D005796:Genes; D008040:Genetic Linkage; D006649:Histocompatibility Antigens; D006868:Hydrolysis; D008970:Molecular Weight; D010455:Peptides / Q000378:metabolism; D011485:Protein Binding; D011487:Protein Conformation
chemical_list: D003172:Complement C1; D003175:Complement C2; D003176:Complement C3; D003181:Complement C4; D006649:Histocompatibility Antigens; D010455:Peptides; D003165:Complement System Proteins