Killer T-cells (IMAGE) University of Cambridge Caption This is a cytotoxic T cell -- the body's 'serial killers' -- as it hunts down and eliminates cancer cells. Credit Gillian Griffiths/Jonny Settle Usage Restrictions With credit 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.