Present in most capillaries, these structures are absent in those of the blood-brain barrier.

Name: Present in most capillaries, these structures are absent in those of the blood-brain barrier.
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Intercellular clefts are gaps between endothelial cells that allow for the passage of substances in most capillaries, but they are absent in the blood-brain barrier to prevent the passage of potentially harmful substances.

Present in Most Capillaries, These Structures Are Absent in Those