908
We then established another cell line by replacing the luciferase gene with the fcy : : fur gene , a suicide gene , and when the cell line was sonicated with 1 MHz ultrasound at 0 . 5 W / cm ( 2 ) , 10 % DF for 60s , expression of the gene was enhanced , showing the maximum expression 12 - 24h 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:
 None