Reduced synapses (IMAGE) Picower Institute at MIT Caption Green staining in hippocampus tissue indicates levels of a protein associated with synapses. The staining is noticeably brighter in a mouse that received healthy human microglia (control) compared to in a mouse that received mutant microglia. Credit Jay Penney/MIT Picower Institute Usage Restrictions with credit License Original 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.