21389
Finally , exposure to nicotine in utero ( 5 mg / kg / day for 5 days ) resulted in increased soma area of DAergic neurons of newborn mice , effects not observed in D3KO mice .
 Chemical: nicotine
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: nicotine