Enkephalin suna ne wanda ke nufin kowane rukuni na peptides na endogenous (irin su leucine-enkephalin) wanda ke ɗaure musamman ga masu karɓa na opiate kuma suna haifar da wasu tasirin magunguna (kamar jin zafi) kamar na opiates; ana samun su musamman a cikin kwakwalwa da kashin baya.
