11720
Exposure to positive control chemicals significantly altered abundances of mRNA in corresponding receptor - centered gene networks , a result that suggests that it is feasible to use zebrafish embryos / larvae to evaluate effects of chemicals on mRNA expression in these gene networks .
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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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