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

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

Old blood can prematurely age the brains of young mice, and scientists may now be closer to understanding how.