from additional studies with purine-substituted ( n6-methyl-adenosine , n6-phenylisopropyl-adenosine ) and ribose-substituted ( 2'-deoxy-adenosine and arabino-furanosyl-adenine ) adenosine analogues , we conclude that adenosine may inhibit the inotropic responses to hormones as well as the adenylate cyclase activity by specifically interacting with at least two different sites associated with the adenylate cyclase .
C0034140
purine
C0001407
adenine