10880
At days 3 - 7 , the COX2 treatment increased Sdf1 - , Cxcr4 - , Nes - , and Podxl - expressing mesenchymal stem cells ( MSCs ) within fracture calluses , suggesting an enhanced MSC recruitment or expansion .
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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