13118
When cells were cultured in 4 x 10 ( 4 ) / well density in culture medium ( 1 mL / well ) , exposed to more than 10 L smog with filter screens above plates , detected after 24 h culture in cell incubator and gunpowder burned out within 5 s , smog had the best effect on cell injury .
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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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