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<?xml version="1.0" encoding="UTF-8"?>
<sbml xmlns="http://www.sbml.org/sbml/level2/version4" level="2" version="4"
xmlns:math="http://www.w3.org/1998/Math/MathML">
<model id="assignmentrules">
<listOfUnitDefinitions>
<unitDefinition id="per_second">
<listOfUnits>
<unit kind="second" exponent="-1"/>
</listOfUnits>
</unitDefinition>
</listOfUnitDefinitions>
<listOfCompartments>
<compartment id="cell" size="1"/>
</listOfCompartments>
<listOfSpecies>
<species id="X0" compartment="cell" initialConcentration="1"/>
<species id="X1" compartment="cell" initialConcentration="0"/>
<species id="T" compartment="cell" initialConcentration="0"/>
<species id="S1" compartment="cell" initialConcentration="0"/>
<species id="S2" compartment="cell" initialConcentration="0"/>
</listOfSpecies>
<listOfParameters>
<parameter id="Keq" value="2.5" units="dimensionless"/>
</listOfParameters>
<listOfRules>
<assignmentRule variable="S1">
<math xmlns="http://www.w3.org/1998/Math/MathML">
<apply>
<divide/>
<ci> T </ci>
<apply>
<plus/>
<cn> 1 </cn>
<ci> Keq </ci>
</apply>
</apply>
</math>
</assignmentRule>
<assignmentRule variable="S2">
<math xmlns="http://www.w3.org/1998/Math/MathML">
<apply>
<times/>
<ci> Keq </ci>
<ci> S1 </ci>
</apply>
</math>
</assignmentRule>
</listOfRules>
<listOfReactions>
<reaction id="in">
<listOfReactants>
<speciesReference species="X0"/>
</listOfReactants>
<listOfProducts>
<speciesReference species="T"/>
</listOfProducts>
<kineticLaw>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<apply>
<times/>
<ci> k1 </ci>
<ci> X0 </ci>
<ci> cell </ci>
</apply>
</math>
<listOfParameters>
<parameter id="k1" value="0.1" units="per_second"/>
</listOfParameters>
</kineticLaw>
</reaction>
<reaction id="out">
<listOfReactants>
<speciesReference species="T"/>
</listOfReactants>
<listOfProducts>
<speciesReference species="X1"/>
</listOfProducts>
<listOfModifiers>
<modifierSpeciesReference species="S2"/>
</listOfModifiers>
<kineticLaw>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<apply>
<times/>
<ci> k2 </ci>
<ci> S2 </ci>
<ci> cell </ci>
</apply>
</math>
<listOfParameters>
<parameter id="k2" value="0.15" units="per_second"/>
</listOfParameters>
</kineticLaw>
</reaction>
</listOfReactions>
</model>
</sbml>
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