using a sensitive assay that measures the conversion of [ 2-3h ] adenine to [ 3h ] cyclic amp , we have shown that ngf alone can not measurably stimulate cyclic amp production , whereas the adenosine analog phenylisopropyladenosine ( pia ) stimulates adenylate cyclase 20-fold over basal activity .
C0001443
adenosine
C0031484
phenylisopropyladenosine