13729
Further , phosphorylation of Akt , ERK , JNK and p38 was increased in cells exposed to TiO2 NPs .
 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