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More modes emerge due to SPK in cooperative self-activating gene (a) A self-activating gene. (b) The stationary PMF for different ε which shows the transition from fast promoter kinetics to SPK in a leaky cooperative self-activation of a gene with cooperativity index 2. The slow kinetic limit is calculated via (10), while the remaining curves are computed by a finite projection solution [57] of the CME. The parameters are α = α_ = ε, k0 = 20, k1 = 100, k_ = 10, β = 10, β_ = 50.]
