A two-site phosphorylation system in which modifications are carried out by different kinases and phosphatases for each phosphoform. Simply, it is assumed that both phosphorylation and dephosphorylation occur sequentially.
i1 : twoSiteModificationE()
o1 = S_0+E_1-->X_1
X_1-->S_0+E_1
X_1-->E_1+S_1
S_1+E_2-->X_2
X_2-->S_1+E_2
X_2-->E_2+S_2
S_1+F_1-->Y_1
Y_1-->S_1+F_1
Y_1-->S_0+F_1
S_2+F_2-->Y_2
Y_2-->S_2+F_2
Y_2-->S_1+F_2
o1 : ReactionNetwork
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To rename species, use substitute(ReactionNetwork,List).
The object twoSiteModificationE is a method function.