13708
The mean expression of aryl hydrocarbon receptor ( AhR ) and peroxisome proliferator - activated receptor gamma ( PPAR gamma ) did not show significant differences between two groups .
 Chemical: aryl hydrocarbon
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: aryl hydrocarbon