Wisdom from Worms (IMAGE) Brown University Caption A study involving C. elegans worms (pictured) and human cells suggests that a deficiency of SMN protein leads to SMA by disrupting the important process of endocytosis. Credit Anne Hart/Brown University Usage Restrictions with credit 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.