7555
Moreover , E ( 2 ) increased mitochondrial manganese superoxide dismutase protein expression and activity , as part of a mechanism activated by E ( 2 ) that improved mitochondrial performance .
 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