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Moreover , luciferase expression could be specifically blocked in HepG2 cells , not in HEK293 cells , showing that the plant extracts displayed a cell - specific pattern on NF - kappa B gene transcription .
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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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