1.   Histological evaluation showed no signs of inflammation or dysplasia.

2.   One section was stained with haematoxylin and eosin for histological evaluation.

3.   The affected ulcerative colitis twins were in clinical remission at the time of biopsy, and histological evaluation showed no signs of mucosal inflammation.

4.   Histological evaluation showed normal mucosa.

5.   Consecutive sections were stained with haematoxylin and eosin for histological evaluation of in-situ hybridisation results.