ALS (IMAGE) InSilico Medicine Caption Amyotrophic Lateral Sclerosis (ALS) is a fatal type of motor neuron disease characterized by progressive degeneration of nerve cells in the spinal cord and brain. Credit Insilico Medicine Usage Restrictions No restrictions. License Public Domain 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.