bath perfusion of normorphine , methionine-enkephalin ( m-e ) or [ d-ala2 , d-leu5 ] -enkephalin ( dadl ) did not alter membrane potential , threshold potential for spike initiation or the spike waveform either before or after addition of ba2+ and 4-aminopyridine .
C0014295
methionine-enkephalin
C0014298
enkephalin