18558
When both stressors were combined , there was a reduction of the antioxidant enzyme superoxide dismutase activity ( SOD ) and an associated increase of oxidative damage in lipids .
 Chemical: superoxide
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