this laboratory has reported recently that muscarinic receptor-stimulated release of norepinephrine from pheochromocytoma ( pc12 ) cells is dependent upon an influx of ca2+ through a ca2+ channel that is regulated by a pertussis toxin-sensitive gtp-binding protein ( g-protein ) ( inoue , k. , and kenimer j. g. ( 1988 ) j. biol . chem . 263 , 8157-8161 ) .
C1149035
gtp-binding
C0086376
g-protein