we have examined direct effects of epinephrine ( epi ) , norepinephrine ( ne ) , the beta-adrenergic agonist isoproterenol ( iso ) , and the alpha-adrenergic agonist phenylephrine ( phe ) on testicular testosterone ( t ) production in hamsters with gonadal regression induced by 12 wk exposure to short photoperiod ( sd ) and in gonadally active hamsters maintained in long photoperiod ( ld ) .
C0014563
epinephrine
C0028351
norepinephrine