A Microglia Cell (Green) Surrounded by Synapses (Red) (image) University of Tokyo Share Print E-Mail Caption Researchers at the University of Tokyo have studied how exercise can change the structure of mouse brains modeling autism spectrum disorder. Exercise likely enhances the difference between active and inactive neuronal connections so that less active ones can be more easily targeted for removal, part of a healthy brain's normal development. Microglia cells (seen above in green) remove those less active synapses. Image originally published in Cell Reports DOI: 10.1016/j.celrep.2019.05.015 Credit Photo by Ryuta Koyama, CC-BY. Usage Restrictions Photo by Ryuta Koyama, CC-BY. 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.