907
When the cell line was sonicated with 1 MHz ultrasound at 0 . 5 W / cm ( 2 ) , 10 % DF for 60s , luciferase expression was enhanced up to 14 . 8 - fold 12h after sonication .
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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:
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