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Compared to the control group of mice , both oxidative stress inducers tested increased the levels of three out of four isoprostanes in exposed animals ; 11 beta - prostaglandin F2 alpha being the exception .
 Chemical: 11 beta - prostaglandin F2 alpha
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: 11 beta - prostaglandin F2 alpha