ici 174,864 , a delta-selective antagonist , reversed the impairment produced by either [ leu5 ] enkephalin or dple , results indicating that delta receptors may play a role in learning in the chick and suggesting that the impairment produced by [ leu5 ] enkephalin is mediated through delta opioid receptors . beta-endorphin produced a naloxone-reversible impairment in performance , which suggests that this impairment is mediated by opioid receptors .
C0140057
delta opioid receptors
C0034801
opioid receptors