Figure 5.

Forcing of the glycolytic subsystem with J_GK = 0.19 μM ms⁻¹. (A) Ca_c is a square-wave oscillation. (B) The phase plane for the GO. The GO chases two different steady states that switch as Ca_c jumps from high to low. The FBP (green) and G6P (orange) nullclines move to the left as Ca_c increases. The trajectory is solid black; the dashed black line indicates that the phase point would have gone to the low Ca_c steady state if Ca_c had not jumped.