7777
Enzymatic activities of SOD , Gpx , Gred and glutathione S - transferase ( GST ) were investigated in the GDC using spectrophoto / fluorometric methods .
 Chemical: glutathione; Chemical: S
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: glutathione; Chemical: S