21428
Altered antioxidant levels were demonstrated by depletion of reduced glutathione ( GSH ) , a decreased ratio of reduced glutathione to oxidized glutathione ( GSH / GSSG ) and an increased NF - E2 - related Factor 2 ( Nrf2 ) activation .
 Chemical: reduced glutathione; Chemical: GSH; Chemical: glutathione; Chemical: oxidized glutathione; Chemical: GSH; Chemical: GSSG
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: reduced glutathione; Chemical: GSH; Chemical: glutathione; Chemical: oxidized glutathione; Chemical: GSH; Chemical: GSSG