2153
Specific to this study , the cellular responses of A549 lung epithelial and MeT - 5A pleural mesothelial cell lines as a means of detecting nanoparticle - induced oxidative stress were examined .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None