24690
The BBB is formed by the endothelial cells lining the brain microvessels , under the inductive influence of neighbouring cell types within the ' neurovascular unit ' ( NVU ) including astrocytes and pericytes .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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