14711
PhMRI of 0 . 04 and 0 . 1 mg / kg i . v . buprenorphine yielded dose - dependent activation in a brain network composed of the somatosensory cortex , cingulate , insula , striatum , thalamus , periaqueductal gray , and cerebellum .
 buprenorphine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 buprenorphine