7155
Because the receptor for TCDD is the aryl hydrocarbon receptor ligand - activated transcriptional regulator , we examined the effects of TCDD exposure on gene expression in the ventricle using DNA microarrays .
 Chemical: TCDD; Chemical: aryl hydrocarbon; Chemical: TCDD
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: TCDD; Chemical: aryl hydrocarbon; Chemical: TCDD