title: A new serum type system in man--the Ld system.
mesh_terms: D001789:Blood Group Antigens; D001798:Blood Proteins; D001803:Blood Transfusion; D002648:Child; D002965:Classification; D006467:Hemophilia A / Q000235:genetics*; D006801:Humans; D007106:Immune Sera; D005779:Immunodiffusion; D007518:Isoantibodies; D008074:Lipoproteins; D008297:Male; D011234:Precipitins
chemical_list: D001789:Blood Group Antigens; D001798:Blood Proteins; D007106:Immune Sera; D007518:Isoantibodies; D008074:Lipoproteins; D011234:Precipitins