18188
The levels of thiobarbituric acid reactive substances ( TBARS , a marker of lipid peroxidation ) and activities of hepatic antioxidant enzymes such as catalase ( CAT ) and glutathione - S - transferase ( GST ) were used to analyze the oxidative stress - mediated lipid peroxidation in liver sections .
 thiobarbituric acid, glutathione, S
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 thiobarbituric acid, glutathione, S