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A: maximum and minimum of [K+]o as a function of [O2]bath in a hyperexcitable neuron (Iext = 0.5 μA/cm2) with [K+]bath = 4.0 mM. Inset: small fast local [K+]o oscillation during tonic firings. The calibration bars are 0.05 s (horizontal) and 0.05 mM (vertical). Membrane potential traces for the 3 regions of bifurcation diagram when [O2]bath is 32 mg/l (B), 27 mg/l (C), and 10 mg/l (D), respectively.
