4778
The neonatal maternal separation ( NMS ) on Sprague - Dawley pups was employed to evaluate the therapeutic effect of KT by virtue of various parameters including visceral hyperalgesia , serum nitric oxide ( NO ) level , and tissue 5 - hydroxytryptamine ( 5 - HT ) level .
 Chemical: nitric oxide; Chemical: NO; Chemical: 5 - hydroxytryptamine; 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: nitric oxide; Chemical: NO; Chemical: 5 - hydroxytryptamine; Chemical: 5 - HT