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Astrocytes and tight junctions create a barrier to viruses and bacteria known as

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User Canoe
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Answer:The blood-brain barrier (BHE)

BHE is a barrier that's highly permeability selective and protects the central nervous system from potential dangers like viruses, bacteria and parasytes that may be circulating int he blood. It is composed of endothelial cells, astrocytes, pericytes.
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User Rich Hildebrand
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