Graphical Abstract (IMAGE) Walter and Eliza Hall Institute Caption As T cells become highly activated, including by stimulation from immunotherapy (anti-PD1), they rely on the energy source, glutamine, to be fully functional. When their access to glutamine is blocked by a drug known as a Glutaminase Inhibitor (GLSi), they are unable to achieve high levels of activation, and their function is impaired. Credit WEHI Usage Restrictions Must credit if re-sharing. 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.