epinephrine , norepinephrine , and isoproterenol produced dose-dependent stimulation of ornithine decarboxylase ( ec 4.1.1.17 ) activity in isolated porcine granulosa cells maintained under defined conditions in vitro . beta- but not alpha-receptor-blocking agents prevented enzyme stimulation by catecholamines .
C0014563
epinephrine
C0028351
norepinephrine