title: A case of crossing over in the HL-A system.
mesh_terms: D000483:Alleles; D000941:Antigens; D002875:Chromosomes; D003434:Crossing Over, Genetic; D005260:Female; D005826:Genetics, Medical; D006648:Histocompatibility; D006801:Humans; D007106:Immune Sera; D007125:Immunogenetics; D008297:Male
chemical_list: D000941:Antigens; D007106:Immune Sera