in the presence of gtp , adenylyl cyclase activity in s49 , ns-20 , and cl was stimulated respectively by isoproterenol and prostaglandin e1 ( pge1 ) , by pge1 and the adenosine analog , phenylisopropyladenosine , and by pge1 and isoproterenol , with the first of the listed stimulants eliciting higher activities than the second .
C0001443
adenosine
C0031484
phenylisopropyladenosine