the pentapeptide leucine enkephalin induced down-regulation of enkephalin receptors in neuroblastoma-glioma ng108-15 hybrid cells in a reversible fashion , whereas the stable enkephalin analogue d-ala2-met-enkephalinamide ( amea ) , and the potent opiate alkaloid , etorphine , had a prolonged effect .
C0014294
leucine enkephalin
C0014298
enkephalin