the ki for the inhibition of cyclic amp synthesis by opioid peptides increased substantially during the period of the cell cycle at which maximal expression of opiate binding sites occurred , making the effective level of inhibition of adenylate cyclase activity by 0.1 microm enkephalin [ d-ala2d-leu5 ] the same through the cell cycle .
C0205753
opioid peptides
C0014298
enkephalin