these results , together with our previous findings that dpen2- [ dpen5 ] enkephalin and [ leu ] enkephalin both impair acquisition of a one-way active avoidance response in mice , and that [ leu ] enkephalin impairs acquisition of that same response in rats , support our suggestion that delta opioid receptors are implicated in the effects of [ leu ] enkephalin on conditioning .
C0014298
enkephalin
C0014294
leu ] enkephalin