Immunohistochemical study on the gastrin, somatostatin and serotonin cells in the gastric and small intestinal mucosa of rat during development

animal tissues estomac gastrin gastrina gastrine immunological techniques intestin intestines intestinos membrana mucosa mucous membrane muqueuse rat rata rats serotonin serotonina somatostatin somatostatina somatostatine stomach technique immunologique tejidos animales tissu animal