In-Vivo 2-Photon Microscopy Image of Endothelial Cells Lining Surface Arteries in the Brain (image) Columbia University School of Engineering and Applied Science Share Print E-Mail Caption Red cells are astrocytes labeled with sulphorhodamine. Our new result suggest that the continuous pathway of endothelial cells within the brain's arteries is essential for propagating signals that orchestrate local dilation and increases in blood flow in response to local neuronal activity. Credit Columbia Engineering Usage Restrictions None Share Print E-Mail 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.