Figure 1.

Pedigrees of 4 Chinese families with inflammatory bowel disease. In family 1, a father and his daughter had CD. Family 2 had 2 monozygotic twin brothers with CD. Family 3 had 4 cousins with CD (2 females and 2 males, two of whom were siblings). Family 4 had 2 sisters with ulcerative colitis. Squares, male family members; circles, female family members; black, affected patients; gray, suspected patients; slashes, deceased family members; arrow, the first diagnosed patient of the family. CD, Crohn's disease.