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HSP70 , reactive oxygen species ( ROS ) production , nuclear factor kappa - light - chain - enhancer of activated B cells ( NF - kappa B ) and protein kinase B ( Akt ) expression were also evaluated .
 Chemical: oxygen
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: oxygen