Meaning of BLOOD-BRAIN BARRIER

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WordNet Dictionary
	Definition:		[n]  a mechanism that creates a barrier between brain tissues and circulating blood; serves to protect the central nervous system; "the brain was protected from the large molecules of the virus by the blood-brain barrier"
	See Also:		barrier
Medical Dictionary
	Definition:		the protective membrane that separates circulating blood from brain cells.
Biology Dictionary
	Definition:		A barrier made up of neuroglia and capillary walls which limits the movement of substances in the bloodstream into the brain.