Table A.1.

Variable names and definitions for the β₁-adrenergic signaling subsystem of the Soltis-Saucerman model.

Variable number	Variable name	Description
1	L	β-AR agonist
2	R	β-AR
3	G	available G-protein
4	β	unphosphorylated β1-AR
5	βBARK	β-AR phosphorylated by β-ARK
6	βPKA	β-AR phosphorylated by PKA
7	Gα, GTP	Total $G_{\alpha }^{\text{GTP}}$
8	Gα, GDP	$G_{\alpha }^{\text{GDP}}$
9	$G_{\beta \gamma }$	$G_{\beta \gamma }$
10	$G_{\alpha ,\mathit{GTP}}^f$	Free $G_{\alpha }^{\text{GTP}}$
11	Fsk	Forskolin
12	AC	adenylyl cyclase
15	c	total cAMP
16	cf	free cAMP
17	PKA c1	Catalytic subunit of PKAI
18	PKA c2	Catalytic subunit of PKAII