%0 Journal Article %T Molecular and cellular mechanisms of the age-dependency of opioid analgesia and tolerance %A Jing Zhao %A Xin Xin %A Guo-xi Xie %A Pamela P Palmer %A Yu-guang Huang %J Molecular Pain %D 2012 %I BioMed Central %R 10.1186/1744-8069-8-38 %K Molecular and cellular mechanisms %K Age-dependency %K Opioid tolerance %U http://www.molecularpain.com/content/8/1/38/abstract