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We report nicotine - induced normalization of effects on locomotion and prepulse inhibition of acoustic startle ( PPI ) in DAT KO mice that require intact serotonin 5 - HT1A systems .
 Chemical: nicotine; Chemical: serotonin
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; Chemical: serotonin