title: Bf polymorphism and ankylosing spondylitis.
mesh_terms: D011415:Complement Factor B / Q000235:genetics*; D004792:Enzyme Precursors / Q000235:genetics*; D005787:Gene Frequency; D006801:Humans; D010641:Phenotype; D011110:Polymorphism, Genetic; D013167:Spondylitis, Ankylosing / Q000235:genetics*
chemical_list: D004792:Enzyme Precursors; D011415:Complement Factor B