title: Component deficiencies. 3. The second component.
mesh_terms: D003175:Complement C2 / Q000172:deficiency* / Q000235:genetics / Q000276:immunology; D005260:Female; D006801:Humans; D007109:Immunity; D008297:Male; D010375:Pedigree; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length
chemical_list: D003175:Complement C2