1365
Serotonergic involvement in the amelioration of behavioral abnormalities in dopamine transporter knockout mice by nicotine .
 Chemical: dopamine; 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: dopamine; Chemical: nicotine