Astrocytes (IMAGE) RIKEN Caption Astrocytespecific expression of ArchT-GFP (green) throughout the GFAP-positive processes (red) with stereotyped astrocyte morphology. Astrocytes were hyperpolarized optogenetically, causing variability of synapse strength to be reduced (as measured by the correlation in paired-pulse ratios at each synapse). Credit RIKEN Usage Restrictions credit RIKEN 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.