26684
Studies on antioxidant enzymes showed that SA further enhanced the activities of superoxide dismutase , ascorbate peroxidase , glutathione reductase and glutathione peroxidase , and also elevated the depressed activities of catalase , dehydroascorbate reductase and glutathione S - transferase particularly at 150 mu M Cu ( 2 + ) stress .
 Chemical: superoxide; Chemical: ascorbate; Chemical: glutathione; Chemical: glutathione; Chemical: dehydroascorbate; Chemical: glutathione; Chemical: S; Chemical: Cu ( 2 + )
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: superoxide; Chemical: ascorbate; Chemical: glutathione; Chemical: glutathione; Chemical: dehydroascorbate; Chemical: glutathione; Chemical: S; Chemical: Cu ( 2 + )