{"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Gastrin is a linear peptide hormone produced by G-cells of the duodenum and in the pyloric antrum of the stomach. It is secreted into the bloodstream."}]},{"type":"paragraph","children":[{"type":"text","value":"Gastrin antibody gives positive staining of G-cells of human antral/pyloric mucosa and cells producing gastrin or a structural gastrin analogue as is seen in the stomach. No staining of other cells or tissue types has been observed. This antibody may react with sulfated and non-sulfated forms of gastrin. The antibody cross-reacts with more than 50% of the present cholecystokinin octapeptide."}]}]}