7158
Because embryonic , but not adult , hearts are major targets for TCDD - induced cardiotoxicity , we speculate that the need for embryonic - like cells in regeneration is connected with the effects of TCDD in inhibiting the response to wounding .
 Chemical: TCDD; 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: TCDD