A New Killer Lymphocyte Enters the Ring (IMAGE) Université de Genève Caption The fight between CD4 T-lymphocytes (in blue) against tumour cells (in orange). Credit 2021 EPFL Hatice Altug 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.