30081
Involvement of serotonin 5 - HT3 receptors in the modulation of noradrenergic transmission by serotonin reuptake inhibitors : a microdialysis study in rat brain .
 serotonin, serotonin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 serotonin, serotonin