title: Homozygosity for HLA-B27 in psoriatic arthritis and spondylitis.
mesh_terms: D000328:Adult; D001172:Arthritis, Rheumatoid / Q000235:genetics*; D006680:HLA Antigens / Q000235:genetics*; D006720:Homozygote; D006801:Humans; D008297:Male; D011565:Psoriasis / Q000235:genetics*; D013166:Spondylitis / Q000235:genetics*
chemical_list: D006680:HLA Antigens