thus , pretreatment of ng108-15 cells containing delta-opioid receptors by the dadle-ellipticinium conjugates induced a loss of opioid receptor ( down-regulation ) , while the smaller peptide conjugates , tyrosinyl-d-alanylglycine-ellipticinium , prepared as control , do not .
C0140057
delta-opioid receptors
C0034801
opioid receptor