2320
Cannabinoid CB 1 receptor in the modulation of stress coping behavior in mice : the role of serotonin and different forebrain neuronal subpopulations .
 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: serotonin