intact mouse neuroblastoma ns20 cells , in the presence of cyclic adenosine 3':5'-monophosphate ( camp ) phosphodiesterase inhibitor , responded to adenosine ( 200 mum ) and 2-chloroadenosine ( 200 mum ) with a 20-fold increase in intracellular camp levels .
C0001443
adenosine
C0000275
2-chloroadenosine