Spleen of LCMV-Infected Mouse (IMAGE) Emory Health Sciences Caption Spleen of LCMV-infected mouse. The population of PD-1-responsive T cells is CD8+ and TCF1+ and thus appears as yellow. Credit From Im <i>et al. Nature (2016)</i> Usage Restrictions To be used in connection with the Nature paper 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.