For a given set of stoichiometric reactions this function calculates the cost of addition in a reference metabolic network. The cost is calculated by dividing the amount of non included metabolites in the reference metabolic network over the total number of metabolites involved in the reaction.
A stoichiometric reaction with the following format:
Where arrows and plus signs are surrounded by a "space character".
It is also expected that stoichiometry coefficients are surrounded by spaces, (nothe the "2" before the CO2[c] or the NH3[c]).
It also expects arrows to be in the form "
A set of stoichiometric reaction with the same format of reaction.
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