552
Interestingly , aromatase B expression was significantly reduced 48 h and 7 days after the injury , but surprisingly , at 72 h after lesion , aromatase B expression appeared de novo expressed in parenchyma cells , suggesting a role for this ectopic expression of aromatase in brain repair mechanisms .
 None
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