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The effects of time delay τ on the p53-Mdm2 system of model (1) when there is certain expression of miR34-a. (A) The positive equilibrium is asymptotically stable when τ = 0. (B) The positive equilibrium is asymptotically stable when τ = 1.5 < τ0 = 3.5578. (C,D) The positive equilibrium is unstable when τ = 4.5 > τ0 = 3.5578.
