This paper is the thirty-fifth consecutive installment of the annual review of research
concerning the endogenous opioid system. It summarizes papers published during 2012
that studied the behavioral effects of molecular, pharmacological and genetic manipulation
of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular
topics that continue to be covered include the molecular-biochemical effects and
neurochemical localization studies of endogenous opioids and their receptors related to …

This paper is the thirty-fourth consecutive installment of the annual review of research
concerning the endogenous opioid system. It summarizes papers published during 2011
that studied the behavioral effects of molecular, pharmacological and genetic manipulation
of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular
topics that continue to be covered include the molecular–biochemical effects and
neurochemical localization studies of endogenous opioids and their receptors related to …