these data suggest ( a ) that the koff constant of [ 3h ] dtlet was regulated by the ionic environment of the delta-opioid receptor , which is clearly dependent on the preservation of cellular structure , and ( b ) that opioid receptors could exist under different states that are regulated , in part , by the intracellular na+ concentration .
C0140057
delta-opioid receptor
C0034801
opioid receptors