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In this study , we employed in vitro and in vivo ( zebrafish ) models to examine the effects of BPA in regulating the expression of genes involved in the thyroid hormone synthesis and of their transcriptional regulators at BPA doses as low as 10 ( - 9 ) M , a dose that is environmentally pertinent and far below the one detected in infants plasma .
 Chemical: BPA; Chemical: thyroid hormone; Chemical: BPA
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: BPA; Chemical: thyroid hormone; Chemical: BPA