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The comment presents the complete steady state solution of the model introduced on ”Steady-state fluctuations of a genetic feedback loop: An exact solution” [Grima et al. J. Chem. Phys. 137, 035104 (2012)]. A closed form for the normalization constant is obtained and hence the explicit calculation of the moments as functions of the parameters is possible. We discuss the meaning of an exact solution to a differential equation and the construction of a model to the understanding of a phenomenon.

Comment on “Steady-state fluctuations of a genetic feedback loop: An exact solution” [J. Chem. Phys. 137, 035104 (2012)]