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NTSAD - Glossary - Blood-brain barrier (BBB)

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Blood-brain barrier (BBB)

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Term Definition
Blood-brain barrier (BBB)

A network of blood vessels with closely spaced cells that makes it difficult for potentially toxic substances (such as anticancer drugs) to penetrate the blood vessel walls and enter the brain. (Definition from: Unified Medical Language System)

A naturally occurring barrier created by the modification of brain capillaries (as by reduction in fenestration and formation of tight cell-to-cell contacts) that prevents many substances from leaving the blood and crossing the capillary walls into the brain tissues -- abbreviation BBB. (Definition from: Merriam-Webster's Medical Dictionary http://www.m-w.com/)

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Synonyms: BBB

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