Model is underconstrained.
The following variables couldn't be defined:
 * J_pm in component Ca_extrusion_across_the_plasma_membrane
 * J_leak in component Ca_extrusion_across_the_plasma_membrane
 * J_extru in component Ca_extrusion_across_the_plasma_membrane
 * Ca_i in component intracellular_calcium
 * J_uni in component mitochondrial_Ca_uptake
 * J_NaCa in component mitochondrial_Ca_release
 * Ca_inhibited_J_NaCa in component mitochondrial_Ca_release
 * J_mito in component mitochondrial_Ca_release
 * delta_Ca_i in component mitochondrial_Ca_release
 * v_m in component mitochondrial_calcium
 * k_m in component mitochondrial_calcium
 * v_i in component mitochondrial_calcium
 * k_i in component mitochondrial_calcium
 * d/dt Ca_i in component intracellular_calcium
 * d/dt Ca_m in component mitochondrial_calcium