Brain’s plumbing may knock out blood test for brain injury
![brain's plumbing system](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/01/ticker_braininjury.jpg?fit=860%2C460&ssl=1)
Plumbing lines (purple) on cells called astrocytes (green) help to wash waste from the brain, shown in mice here. The plumbing may also make it hard to create a blood test for traumatic brain injury.