Where Tumor Cells Enter the Bloodstream (IMAGE) Scripps Research Institute Caption On the left, stained red blood vessels weave between florescent green tumor cells. On the right, the researchers have mapped exactly where tumor cells (white) have entered blood vessels. The image shows that more cells enter blood vessels in the tumor's core than its invasive border. Credit Elena Deryugina and William Kiosses Usage Restrictions None 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.