16594
Immunoprecipitation of mitochondrial SOD followed by analysis of 3 - nitrotyrosine revealed increased levels of nitrated mitochondrial SOD , suggesting the mechanism underlying the atorvastatin withdrawal - induced decrease in enzyme activity .
 Chemical: 3 - nitrotyrosine; Chemical: atorvastatin
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: 3 - nitrotyrosine; Chemical: atorvastatin