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Such a self-excited oscillation can be re-generated even on an electric circuit.
Meanwhile, in a biological system, a membrane plays role to cause a self-excited oscillation.
Because, when a gradient in ion-concentration namely a difference in energy through a membrane exists in the system, that is, the system is at non-equilibrium, the flow of ions originated from the gradient in energy is easy to cause symmetry-breaking in time such as self-excited oscillation.
※ In this case, symmetry-breaking in time can be observed in a DOPH-membrane too.
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