Cancer Stem Cells (IMAGE) Rockefeller University Caption TGF beta signaling (red) is one way that the environment causes cancer stem cells at the stroma-tumor border (green) to become invasive. Living cells are dyed blue. Credit Shaopeng Yuan Usage Restrictions Image may be used only to illustrate the research described in the accompanying release. 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.