Astrocytes in Master Clock Light up When Expressing Clock Genes (image) Washington University in St. Louis Share Print E-Mail Caption In this slice of the master clock, cells expressing an astrocyte-specific structural protein that had been stained red (top right panel) matched up well with cells that had been equipped to fluoresce green when they were expressing a clock gene (middle right panel), demonstrating that the scientists could watch astrocytes tick in the clock. Credit Herzog Lab. Usage Restrictions Please credit 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.