The dopamine and opiate mechanisms are rather tangled together in practice:
The following study tests the hypothesis that dopamine is an essential mediator of various opiate-induced responses:
http://www.nature.com/nature/journal/v438/n7069/full/nature04172.html
The dopamine and opiate mechanisms are rather tangled together in practice:
The following study tests the hypothesis that dopamine is an essential mediator of various opiate-induced responses:
http://www.nature.com/nature/journal/v438/n7069/full/nature04172.html