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The focus of this work , therefore , deals with examination of the cellular signaling pathways responsible for TiO2 NP - induced endothelial oxidative stress and inflammation .
 Chemical: TiO2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: TiO2