we have compared the distribution of oxytocin , vasopressin and enkephalin immunoreactivity ( ir ) in the neurohypophysis of the rat , and report here that met-enkephalin-ir is invariably associated with nerve terminals that contain oxytocin-ir whereas the terminals that contain vasopressin-ir often , but not invariably , are leu-enkephalin immunoreactive .
C0014298
enkephalin
C0014295
met-enkephalin