22127
CONCLUSIONS : Our results provide novel evidence that there are two distinct mechanisms that mediate ethanol - stimulated mesolimbic dopamine release ( an initial phase and a delayed phase ) , and that opioid receptor activation is required to maintain the delayed - phase dopamine release .
 Chemical: ethanol; Chemical: dopamine; Chemical: dopamine
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: ethanol; Chemical: dopamine; Chemical: dopamine