3396
Serotonin and N - acetyl serotonin which augmented ketamine DOC , did not do so in the absence of the pineal gland , whereas melatonin potentiated the ketamine DOC in both the intact and pinealectomized chick .
 Chemical: Serotonin; Chemical: N - acetyl serotonin; Chemical: ketamine; Chemical: melatonin; Chemical: ketamine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: Serotonin; Chemical: N - acetyl serotonin; Chemical: ketamine; Chemical: melatonin; Chemical: ketamine