this study reports data on metabolic parameters of human spermatozoa in the presence of a met-enkephalin analogue : d-ala2-mephe4-met- ( o ) -ol-enkephalin , fk 33824 , sandoz , basel , switzerland ( damme ) , and its receptor antagonist naloxone hydrochloride , endo laboratories , garden city , new york .
C0014295
met-enkephalin
C0014298
enkephalin