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Exposure of the embryos to TCDD revealed previously reported ( the cardiovascular system , liver , pancreas , kidney , swim bladder and skin ) and unreported target tissues ( retinal bipolar cells , otic vesicle , lateral line , cloaca and pectoral fin bud ) for TCDD .
 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