Immune cells in lymph nodes (IMAGE) University of Würzburg Caption A picture of immune cells in a lymph node. Resident cells are marked in red, circulating ones in cyan. What is striking is that regulatory T cells (outlined in yellow) are found in both forms. Credit Milas Ugur / JMU Usage Restrictions - 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.