the ability of estradiol to suppress noradrenaline activation of adenyl cyclase in epiphysial homogenates and its inability to suppress the same activation of serotonin n-acetyltransferase suggests either that the activation of the latter enzyme by catecholamines could occur by other mechanisms than the adenyl cyclase system or that activation of adenyl cyclase by noradrenaline is not suppressed by estradiol to the same degree in vivo as in vitro .
C0007412
catecholamines
C0028351
noradrenaline