after fractionation of rabbit bone marrow into dividing ( early ) and non-dividing ( late ) erythroid cells , the adenylate cyclase activity of membrane ghosts was assayed in the presence of guanine nucleotides ( ( gtp and its analogue p [ nh ] ppg ( guanosine 5'- [ beta , gamma-imido ] triphosphate ) ) ) , the beta-adrenergic agonist l-isoprenaline ( l-isoproterenol ) and the antagonist l-propranolol .
C0018328
guanine nucleotides
C0018353
gtp