![](http://www.alamy.com/thumbs/6/609D59E6-66EA-4B7F-B069-F1741E7D3113/2AD18WF.jpg)
The blood-brain barrier is a highly selective permeable membrane that controls what substances pass from the blood stream into the brain.
Size: 6060px × 4039px
Photo credit: © CAROL & MIKE WERNER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
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