12784
NBH embryos had lower basal expression of antioxidant genes catalase and glutathione - S - transferase alpha ( gsta ) , and upon exposure to tBHQ , exhibited lower levels of expression of catalase , gsta , and superoxide dismutase compared to controls .
 Chemical: glutathione; Chemical: S; Chemical: tBHQ; Chemical: superoxide
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: glutathione, S, tBHQ, superoxide 
Answer:
 Chemical: glutathione; Chemical: S; Chemical: tBHQ; Chemical: superoxide