Astrocyte with Marker (image) University of Bonn Share Print E-Mail Caption The photo was obtained by filling an astrocyte with a marker (biocytin, red) in a section of the brain. When coupling is intact, this molecule diffuses into neighboring astrocytes and an entire functional network thus becomes visible. Credit Photo: Institute of Cellular Neurosciences/University of Bonn Usage Restrictions This photo may be used with the press release. 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.