Combo (IMAGE) Johns Hopkins Medicine Caption This immunotherapy technique combines artificial antigen presenting cells (orange) with anti-PD-1 antibodies (yellow) to activate killer T cells (pink) and prevent tumor cells (brown) from damping that response. Credit Alyssa Kosmides and Randall Meyer, Johns Hopkins Medicine 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.