29038
An increase in intracellular reactive oxygen species ( ROS ) was observed in AC - treated cells , whereas the antioxidant N - acetylcysteine ( NAC ) prevented AC - induced cell death , HER - 2 / neu depletion , PI3K / Akt inactivation , and Bcl - 2 / Bax dysregulation , indicating that AC - induced cell death was mediated by ROS generation .
 Chemical: oxygen; Chemical: N - acetylcysteine; Chemical: NAC
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; Chemical: N - acetylcysteine; Chemical: NAC