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The CXCL12 / CXCR4 / CXCR7 ligand - receptor system regulates neuro - glio - vascular interactions and vessel growth during human brain development .
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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:
 None