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Polybrominated diphenyl ethers ( PBDEs ) and their oxidative metabolites ( hydroxylated PBDEs ; OH - BDEs ) are known endocrine disrupting contaminants that have been shown to disrupt thyroid hormone regulation both in mammals and in fish .
 Chemical: Polybrominated diphenyl ethers; Chemical: PBDEs; Chemical: hydroxylated PBDEs; Chemical: OH - BDEs; Chemical: thyroid hormone
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: Polybrominated diphenyl ethers; Chemical: PBDEs; Chemical: hydroxylated PBDEs; Chemical: OH - BDEs; Chemical: thyroid hormone