Cellular ‘waste product’ rejuvenates cancer-fighting immune cells (IMAGE) UT Southwestern Medical Center Caption UT Southwestern Simmons Cancer Center found that lactate, a metabolic byproduct produced by cells during strenuous exercise, can rejuvenate immune cells that fight cancer. The image shows single cell transcriptome analysis enrichment of tumor infiltrating T cells, the red dots, after lactate treatment. Credit UT Southwestern Medical Center Usage Restrictions none 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.