indeed , the toxin-treated adenylate cyclase was maximally activated , in the presence of isoproternol , by either gtp or gpp ( nh ) p , while adenylate cyclase not treated with toxin was stimulated by hormone plus gtp to only one-fifth of the activity achieved with hormone plus gpp ( nh ) p .
C0018353
gtp
C0018366
gpp ( nh ) p