title: Letter: HL-A 27 and ankylosing spondylitis.
mesh_terms: D000328:Adult; D002648:Child; D005260:Female; D005796:Genes; D006680:HLA Antigens / Q000302:isolation & purification*; D006649:Histocompatibility Antigens / Q000302:isolation & purification*; D006720:Homozygote; D006801:Humans; D008297:Male; D010375:Pedigree; D013167:Spondylitis, Ankylosing / Q000235:genetics / Q000276:immunology*
chemical_list: D006680:HLA Antigens; D006649:Histocompatibility Antigens