title: The complement system in clinical diagnosis.
mesh_terms: D000936:Antigen-Antibody Complex; D003181:Complement C4 / Q000032:analysis; D003170:Complement Pathway, Alternative; D003171:Complement Pathway, Classical; D003165:Complement System Proteins / Q000032:analysis / Q000502:physiology*; D006801:Humans; D012874:Skin Diseases, Infectious / Q000276:immunology*
chemical_list: D000936:Antigen-Antibody Complex; D003181:Complement C4; D003165:Complement System Proteins