The blood-brain barrier, which keeps harmful molecules from entering the brain, is composed of __________ that form a fatty coating around tiny blood vessels.

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The blood-brain barrier is composed of glial cells, specifically astrocytes, that form a fatty coating around tiny blood vessels in the brain. This barrier protects the brain from harmful molecules and pathogens that may be present in the bloodstream.

The Blood-Brain Barrier, Which Keeps Harmful Molecules from Entering the Brain