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Inhibition of vitellogenin gene induction by 2 , 3 , 7 , 8 - tetrachlorodibenzo - p - dioxin is mediated by aryl hydrocarbon receptor 2 ( AHR2 ) in zebrafish ( Danio rerio ) .
 Chemical: 2 , 3 , 7 , 8 - tetrachlorodibenzo - p - dioxin; 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: 2 , 3 , 7 , 8 - tetrachlorodibenzo - p - dioxin; Chemical: aryl hydrocarbon