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Text in this example:
Blood-Brain Barrier Where no blood brain barrier
exists glucose and proteins
pass freely out of circulation
system. No Blood-Brain Barrier Blood-Brain Barrier Glucose Protein Cellular barriers interposed
between the blood and
neurons of the brain,
note exclusion of proteins. LifeART Collection Images Copyright © 1989-2001 by Lippincott Williams & Wilkins, Baltimore, MD