title: Discordance for psoriatic arthropathy in monozygotic twins.
mesh_terms: D000368:Aged; D001168:Arthritis / Q000209:etiology / Q000235:genetics*; D004200:Diseases in Twins; D005260:Female; D006801:Humans; D008297:Male; D011247:Pregnancy; D011565:Psoriasis / Q000150:complications* / Q000235:genetics; D014430:Twins, Monozygotic