13615
The obtained results support this hypothesis showing that together with CXCR4 / CXCR7 - reactive neuroblasts , which migrate in close association with CXCL12 RGCs , layer - specific subsets of CXCL12 RGCs and astrocytes specifically contact the microvessel wall .
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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