3709
The rate of NA turnover was not altered by analgesics except for the higher dose of fentanyl ( 0 . 2 mg / kg ) following which the disappearance of NA from the brain was diminished .
 Chemical: NA; Chemical: fentanyl; Chemical: NA
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: NA; Chemical: fentanyl; Chemical: NA