19897
Serotonin - kynurenine hypothesis of depression : historical overview and recent developments .
 Chemical: Serotonin; Chemical: kynurenine
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; Chemical: kynurenine