these data not only further support the existence of independent presynaptic mu- , delta- and kappa-opioid receptors in rat brain but also evidence strongly that mu and delta receptors mediating the inhibition of da-sensitive adenylate cyclase could share a common binding site ( for naloxone and fit ) and , therefore , may represent constituents of a functional opioid receptor complex .
C0140057
delta
C0034801
opioid receptor