Vessel trouble (IMAGE) Picower Institute at MIT Caption Stained motor cortex tissue from a donor with ALS (right) shows reduced amounts of the protein HLA-E (green) in the vasculature. HLA-E is thought to inhibit degradation of the Blood Brain Barrier by the immune system. Researchers found reduced expression of HLA-E in both ALS and FTLD. Credit Heiman Lab/MIT Picower Institute Usage Restrictions with credit License Original 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.