Immunohistochemical Staining (IMAGE) Université de Genève Caption Immunohistochemical staining for the insulin receptor (INSR) in a microscopic section of human stomach cancer. A clear overexpression of this receptor (brown) is seen in the tumor tissue, while this is absent in non-cancerous stomach tissues. Credit UNIGE / DR Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.