title: Report 1973-1974 of the Reference Laboratory for the polymorphism of the third component (C3) of the human complement system.
mesh_terms: D001797:Blood Protein Electrophoresis; D003165:Complement System Proteins / Q000378:metabolism; D005787:Gene Frequency; D014644:Genetic Variation; D006801:Humans; D010641:Phenotype; D011110:Polymorphism, Genetic
chemical_list: D003165:Complement System Proteins