Pictures of specialized immune cells (IMAGE) University of California - San Diego Caption Researchers captured microscopic photographs of specialized cells of the immune system known as tissue-resident CD8 T cells (epithelial cells are shown in cyan, immune cells in a combination of green and red), seen here in the small intestine. Credit Kianoosh Mempel Usage Restrictions Must be used in conjunction with Nature paper on CD8 T cells and immune defense. License Original 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.