
Keywords: 3 '، 5'-cyclic guanosine monophosphate; cAMP; 3â²,5â²-cyclic adenosine monophosphate; β-AR; β-adrenergic receptor; cGMP; 3â²,5â²-cyclic guanosine monophosphate; FRET; Förster resonance energy transfer; IBMX; 3-isobutyl-1-methylxanthine; ISO; isoproterenol; PDE; phosphodiesterase; SICM; s