4247
In the livers , oxidative / nitrosative stress was evidenced by increased 3 - nitrotyrosine ( 3 - NT ) and thiobarbituric acid reactive substances ( TBARS ) formation and a significant decrease in Cu / Zn superoxide dismutase ( SOD ) activity .
 Chemical: 3 - nitrotyrosine; Chemical: 3 - NT; Chemical: thiobarbituric acid; Chemical: Cu; Chemical: Zn; Chemical: superoxide
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: 3 - nitrotyrosine, 3 - NT, thiobarbituric acid, Cu, Zn, superoxide 
Answer:
 Chemical: 3 - nitrotyrosine; Chemical: 3 - NT; Chemical: thiobarbituric acid; Chemical: Cu; Chemical: Zn; Chemical: superoxide