26210
Dorsal raphe nucleus ( DRN ) serotonin ( 5 - HT ) neurons projecting to the prefrontal cortex ( PFC ) comprise the important neurocircuitry underlying the pathophysiology of depression .
 Chemical: serotonin; Chemical: 5 - HT
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: 5 - HT