Surrounded (IMAGE) University of Pennsylvania School of Medicine Caption Microglia (red) surrounding a motor neuron in the spinal cord of an engineered mouse and actively clearing human TDP-43 (green) following transgene suppression. Scale = 100 μm. Credit Virginia M-Y. Lee, PhD and Krista J. Spiller, PhD, Perelman School of Medicine at the University of Pennsylvania 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.