Protein helps old blood age the brains of young mice
Scientists hone in on activity in the blood-brain barrier as the culprit
![mouse brain capillary](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/01/101018_LS_old-young-mouse_main.jpg?fit=860%2C460&ssl=1)
NO BARRIER A protein in some cells that form the blood-brain barrier (light blue, as seen in this image of a mouse brain capillary) may have a hand in brain aging, a new study suggests.
Wellcome Images/Science Source