Fig. 1. Identification of ODE systems. (A) An identification problem can be specified with real or simulated data from one or several experiments, a model space of allowed reactions occurring on the right-hand side of the ODEs, an initial model representing prior knowledge and an error function. (B) An example of an identification problem with a model space of three traditional chemical reaction types, an error function where L=likelihood function, λ K=structural complexity term (λ=constant and K=number of model parameters) and an initial model with no prior information. (C) An example of a solution model.