the similarity in the concentrations of des-tyr- [ leu ] enkephalin required to compete for specific [ leu ] enkephalin binding and to inhibit proline transport suggests that a specific subclass of enkephalin binding sites , distinguished by their recognition of both the enkephalins and their des-tyrosyl derivatives , may be associated with the synaptic proline transport system .
C0014294
leu ] enkephalin
C0014298
enkephalins