Protein Tangles (IMAGE) University of California - San Diego Caption Exposing mice to 14 days of repeated stress resulted in an accumulation of insoluble phosphorylated tau protein aggregates in brain cells, visualized in this electron micrograph. Credit Image courtesy of Robert Rissman, UC San Diego 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.