<?xml version="1.0" encoding="UTF-8"?>
<sbml xmlns="http://www.sbml.org/sbml/level2" level="2" version="1">
  <model id="Activation">
    <listOfUnitDefinitions>
      <unitDefinition id="substance">
        <listOfUnits>
          <unit kind="item" multiplier="1" offset="0"/>
        </listOfUnits>
      </unitDefinition>
    </listOfUnitDefinitions>
    <listOfCompartments>
      <compartment id="Cell"/>
    </listOfCompartments>
    <listOfSpecies>
      <species id="A" compartment="Cell" initialAmount="0" hasOnlySubstanceUnits="true"/>
      <species id="I" compartment="Cell" initialAmount="1" hasOnlySubstanceUnits="true"/>
    </listOfSpecies>
    <listOfReactions>
      <reaction id="Activation" reversible="false">
        <listOfReactants>
          <speciesReference species="I"/>
        </listOfReactants>
        <listOfProducts>
          <speciesReference species="A"/>
        </listOfProducts>
        <kineticLaw>
          <math xmlns="http://www.w3.org/1998/Math/MathML">
            <ci> alpha </ci>
          </math>
          <listOfParameters>
            <parameter id="alpha" value="0.5"/>
          </listOfParameters>
        </kineticLaw>
      </reaction>
      <reaction id="Inactivation" reversible="false">
        <listOfReactants>
          <speciesReference species="A"/>
        </listOfReactants>
        <listOfProducts>
          <speciesReference species="I"/>
        </listOfProducts>
        <kineticLaw>
          <math xmlns="http://www.w3.org/1998/Math/MathML">
            <ci> beta </ci>
          </math>
          <listOfParameters>
            <parameter id="beta" value="1"/>
          </listOfParameters>
        </kineticLaw>
      </reaction>
    </listOfReactions>
  </model>
</sbml>

