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The mouse embryonic stem cell test ( EST ) is a 10 - day screen for teratogenic potential developed to reduce animal use for embryotoxicity testing of chemicals ( Spielmann , 2005 ; Spielmann et al . , 1997 ) .
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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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