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Cartoon illustration of a brain with blood vessels. A magnified view shows a tight junction blocking smiley-faced molecules in a vessel.

Cartoon illustration of a brain with blood vessels. A magnified view shows a tight junction blocking smiley-faced molecules in a vessel.

Cartoon brain with a blood vessel. The blood vessel has a tight junction. There are drug molecules in the blood vessel that can't get past the tight junction. See more

#medical illustration #biology #cartoon

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