Zhang Motor Neurons (image) University of Wisconsin-Madison Caption In this microscope photo of motor neurons created in the laboratory of Su-Chun Zhang at the University of Wisconsin-Madison, green marks the nucleus, and red marks the nerve fibers. Zhang and co-workers at the Waisman Center have identified a misregulation of protein in the nucleus as the likely first step in the pathology of ALS, a fatal neurological disorder that blocks nerve signals to the muscles, and later causes motor neurons to die. Credit Hong Chen and Su-Chun Zhang, Waisman Center, University of Wisconsin-Madison Usage Restrictions None 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.