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Which cell make up the blood-brain barrier?

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Which cell make up the blood-brain barrier?

(a) Squamous epithelium cells

(b) Fat cells

(c) Red blood cell

(d) Endothelial cells

I have been asked this question in a job interview.

My query is from Drug Distribution topic in section Distribution of Drugs of Drug Biotechnology

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Correct option is (d) Endothelial cells

Easiest explanation: The brain capillaries are made up of epithelial cells joined to one another by continuous tight intercellular junctions thereby making the blood-brain barrier. These are highly specialized capillaries which are much less permeable to water-soluble drugs.

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