13614
According to our hypothesis CXCL12 , a potent migration and differentiation chemokine released by RGCs , may act as a linking factor coordinating neuroblast migration with vessel growth and patterning through the activation of different ligand / receptor axes .
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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