One of the major obstacles to treating neurological disorders such as Alzheimer’s disease is the blood-brain barrier: drugs that are injected into the circulation usually do not enter the brain effectively. Researchers at Denali Therapeutics Inc., Biogen Inc. and the University of Minnesota have devised a vehicle for transporting antibodies against amyloid-β that can bypass the blood-brain barrier by binding to the transferrin receptor, which is expressed much more abundantly in capillaries than in arteries.