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Young CD - 1 mice , 4 days old , exposed to 0 . 1 % nicotine sulfate on gestational days 6 - 20 were compared with untreated pups of the same age to determine its effect on the development of mandibular first molars .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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