8337
Here , using the cumulative of these studies , we compared gene expression profiles of ESTn and ESTc over time as well as model - specific changes induced by seven compounds , comprising six known in vivo developmental toxicants and one negative control .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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