1 the effects of leu-enkephalin , met-enkephalin and morphine on excitatory junction potentials ( e.j.ps ) and inhibitory junction potentials ( i.j.ps ) elicited by stimulation of efferent parasympathetic nerves were studied in cats and rabbits , anaesthetized and in vitro.2 enkephalins ( 0.008 mg/kg in vivo and 10 ( -6 ) m in vitro ) enhanced e.j.p . amplitude in rabbit proximal colon and decreased it in rabbit distal colon and in cat colon .
C0014294
leu-enkephalin
C0014298
enkephalins