Mouse Pancreatic Tissue (IMAGE) Cold Spring Harbor Laboratory Caption A cross-section of mouse pancreatic tumor tissue. These cancer cells (stained purple) lack a protein called KRT19 on their outer layer that is part of a complex that deactivates T cell (green) movement. Without KRT19, T cells are able to infiltrate the tumor. Cell nuclei are labeled in blue. Credit ZhiKai Wang/Fearon lab/CSHL, 2022 Usage Restrictions Attribution required 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.