ALS Protein (image) Washington University School of Medicine Caption A mutated protein that causes an inherited form of Lou Gehrig's disease leads to clumps in the human cells in the bottom image. A therapy that blocks production of this protein has passed phase one safety trials. Credit Matthew J. Crisp Usage Restrictions Please include credit. 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.