the characteristics of mu and delta opioid receptor sites present in human neuroblastoma sh-sy5y cells were investigated using [ d-ala2-n-methyl-phe4-gly- ( 01 ) 5 ] enkephalin ( dago ) and [ 2-d-penicillamine , 5-d-penicillamine ] enkephalin ( dpdpe ) , which are the most selective radioligands available for mu and delta sites , respectively .
C0014298
enkephalin
C0525856
dpdpe