1894
These observations allow us to propose that the in vitro toxic effects of AgNPs on A549 cells are mediated via both ROS - dependent ( cytotoxicity ) and ROS - independent ( cell cycle arrest ) pathways .
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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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