11.   In vitro gastric antral biopsies were stimulated by vortex mixing and eicosanoid measurements determined by radioimmunoassay.

12.   H pylori infection was confirmed in the duodenal ulcer patients by microscopic examination of antral biopsy rapid urease test on antral biopsy, and by C urea breath test.

13.   Gastric antral biopsy specimens were also taken to check for the presence of H pylori by histology and culture, as previously described.