Methadone antinociception is dependent on peripheral opioid receptors.

He L, Kim J, Ou C, McFadden W, van Rijn RM, Whistler JL. Methadone antinociception is dependent on peripheral opioid receptors. J Pain. 2009 Apr; 10(4):369-79.

2009
http://profiles.ucsf.edu/profile/285280
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He L, Kim J, Ou C, McFadden W, van Rijn RM, Whistler JL