1788
Additionally , more specific mechanisms exist where xenobiotics act as ligands , including the aryl hydrocarbon receptor , metal - responsive transcription factor - 1 and the nuclear receptor family of transcription factors .
 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