An Unbiased View of buy actavis promethazine with codeine online
G-protein coupled opioid receptor that functions as being a receptor for endogenous alpha-neoendorphins and dynorphins, but has low affinity for beta-endorphins. Also functions like a receptor for several synthetic opioids and for the psychoactive diterpene salvinorin A. Ligand binding results in a conformation change that triggers signaling by mea