Crossing-over within the HL-A system.
D001792:Blood Platelets / Q000276:immunology; D002874:Chromosome Mapping; D003434:Crossing Over, Genetic; D005260:Female; D006650:Histocompatibility Testing; D006801:Humans; D008297:Male; D011110:Polymorphism, Genetic; D011995:Recombination, Genetic; D014181:Transplantation Immunology