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# twoSiteModificationF -- an example for chemical reaction motif

## Description

A two-site phosphorylation system where phosphorylation is catalyzed by the same kniase at both sites but dephosphorylation is catalyzed by different phosphateases. It assumes sequential (de)phosphorylation.

    i1 : twoSiteModificationF()

    o1 = S_0+E-->X_1
         X_1-->S_0+E
         X_1-->E+S_1
         E+S_1-->X_2
         X_2-->E+S_1
         X_2-->E+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

To rename species, use substitute(ReactionNetwork,List).

## Ways to use twoSiteModificationF:

- `twoSiteModificationF()`

## For the programmer

The object twoSiteModificationF is a method function.

The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/ReactionNetworks/TwositeModificationF.m2:15:0.