jimpy ( b6cba-a w-j/a-ta jp ) mice , which are known to be deficient in neuronal cerebroside sulfate ( a putative component of the mu opioid receptor ) , were non-responsive in the tail flick test ( compared to littermate controls and a standard swiss strain of mouse ) to analgesic doses of two mu opioid receptor agonists , morphine sulfate and [ d-ala2 , mephe4 , gly-ol5 ] enkephalin ( dago ) .
C0014298
enkephalin
C0525773
dago