12993
These increases were concomitant with similar increases in the generation of reactive oxygen species ( ROS ) ; these phenomena were mitigated by co - treatment with the antioxidant alpha - tocopherol .
 oxygen, alpha - tocopherol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 oxygen, alpha - tocopherol