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To evaluate the DRN - PFC 5 - HT system in WKY rats , we examined the effects of escitalopram ( ESCIT ) on the extracellular 5 - HT level in comparison with Wistar rats using dual - probe microdialysis .
 Chemical: 5 - HT; Chemical: escitalopram; Chemical: ESCIT; 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: 5 - HT; Chemical: escitalopram; Chemical: ESCIT; Chemical: 5 - HT