17354
Cells were treated with four known sensitizers and two nonsensitizers , and the effects on the expression of 20 candidate genes and the activation of MAPK , PI3K / Akt , and NF - kappa B signaling pathways were analyzed by real - time reverse transcription polymerase chain reaction and Western blotting , respectively .
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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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