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The purpose of this study was to determine the precise organ and tissue locations that express genes critical to thyroid hormone regulation in developing zebrafish ( Danio rerio ) , and to determine the effects of an OH - BDE on their expression .
 Chemical: thyroid hormone; Chemical: OH - BDE
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: thyroid hormone; Chemical: OH - BDE