31.   The stomach is exposed to dietary hazards and potential carcinogens throughout life, but the origins of gastric carcinoma within normal mucosa remain unknown.

32.   The results of this study show that in normal human intestinal mucosa PAF activity is generated by both epithalial cells and lamina propria mononuclear cells.

33.   If the latter were true, random sampling of the normal mucosa would be less reliable as a means of ascertaining risk.

34.   Twenty patients taking NSAIDs had a histologically normal gastric antral mucosa.

35.   Recent studies have suggested an increased activity of expression of glutathione S-transferases in colonic tumour cells compared with normal non-neoplastic mucosa.

36.   Examination round to the caecum showed no abnormality and biopsy specimens showed normal colonic mucosa.