title: Discordant occurrence of ulcerative colitis in identical twins.
mesh_terms: D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D003093:Colitis, Ulcerative / Q000235:genetics*; D004200:Diseases in Twins; D005260:Female; D005799:Genes, Dominant; D006801:Humans; D008875:Middle Aged; D010375:Pedigree