<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated 26-November-2003 10:15:32.996435 -->
<!-- Generated by MathSBML 2.2.1-beta-9 (25 Nov 2003) -->
<sbml xmlns="http://www.sbml.org/sbml/level2"
    level="2"
    version="1">
 <model id="repressilator"
     name="Repressilator Model">
  <listOfFunctionDefinitions/>
  <listOfUnitDefinitions/>
  <listOfCompartments>
   <compartment id="cell"
       name="cell"/>
  </listOfCompartments>
  <listOfSpecies>
   <species id="x"
       name="x"
       compartment="cell"
       boundaryCondition="false"
       constant="false"/>
   <species id="y"
       name="y"
       compartment="cell"
       boundaryCondition="false"
       constant="false"/>
   <species id="z"
       name="z"
       compartment="cell"
       boundaryCondition="false"
       constant="false"/>
   <species id="py"
       name="py"
       compartment="cell"
       boundaryCondition="false"
       constant="false"/>
   <species id="px"
       name="px"
       compartment="cell"
       boundaryCondition="false"
       constant="false"
       initialAmount="5"/>
   <species id="pz"
       name="pz"
       compartment="cell"
       boundaryCondition="false"
       constant="false"
       initialAmount="15"/>
   <species id="null"
       name="null"
       compartment="cell"
       boundaryCondition="true"
       constant="true"/>
  </listOfSpecies>
  <listOfParameters>
   <parameter id="alpha"
       name="alpha"
       value="250"/>
   <parameter id="beta"
       name="beta"
       value="5"/>
   <parameter id="alpha0"
       name="alpha0"
       value="0"/>
   <parameter id="alpha1"
       name="alpha1"
       value="0"/>
   <parameter id="n"
       name="n"
       value="2.1"/>
   <parameter id="k1"
       name="k1"
       value="1"/>
   <parameter id="K"
       name="K"
       value="1"/>
  </listOfParameters>
  <listOfRules/>
  <listOfReactions>
   <reaction id="reaction1"
       name="reaction1"
       reversible="true"
       fast="false">
    <listOfReactants>
     <speciesReference species="null"/>
    </listOfReactants>
    <listOfProducts>
     <speciesReference species="x"/>
    </listOfProducts>
    <listOfModifiers>
     <modifierSpeciesReference species="pz"/>
    </listOfModifiers>
    <kineticLaw timeUnits="time"
        substanceUnits="substance">
     <math xmlns="http://www.w3.org/1998/Math/MathML">
      <apply>
       <plus/>
       <ci>alpha0</ci>
       <apply>
        <times/>
        <apply>
         <plus/>
         <apply>
          <times/>
          <ci>alpha1</ci>
          <apply>
           <power/>
           <ci>pz</ci>
           <ci>n</ci>
          </apply>
         </apply>
         <ci>alpha</ci>
        </apply>
        <apply>
         <power/>
         <apply>
          <plus/>
          <apply>
           <power/>
           <ci>K</ci>
           <ci>n</ci>
          </apply>
          <apply>
           <power/>
           <ci>pz</ci>
           <ci>n</ci>
          </apply>
         </apply>
         <cn type="integer">-1</cn>
        </apply>
       </apply>
       <apply>
        <times/>
        <cn type="integer">-1</cn>
        <apply>
         <times/>
         <ci>k1</ci>
         <ci>x</ci>
        </apply>
       </apply>
      </apply>
     </math>
     <listOfParameters/>
    </kineticLaw>
   </reaction>
   <reaction id="reaction2"
       name="reaction2"
       reversible="true"
       fast="false">
    <listOfReactants>
     <speciesReference species="null"/>
    </listOfReactants>
    <listOfProducts>
     <speciesReference species="y"/>
    </listOfProducts>
    <listOfModifiers>
     <modifierSpeciesReference species="px"/>
    </listOfModifiers>
    <kineticLaw timeUnits="time"
        substanceUnits="substance">
     <math xmlns="http://www.w3.org/1998/Math/MathML">
      <apply>
       <plus/>
       <ci>alpha0</ci>
       <apply>
        <times/>
        <apply>
         <plus/>
         <apply>
          <times/>
          <ci>alpha1</ci>
          <apply>
           <power/>
           <ci>px</ci>
           <ci>n</ci>
          </apply>
         </apply>
         <ci>alpha</ci>
        </apply>
        <apply>
         <power/>
         <apply>
          <plus/>
          <apply>
           <power/>
           <ci>K</ci>
           <ci>n</ci>
          </apply>
          <apply>
           <power/>
           <ci>px</ci>
           <ci>n</ci>
          </apply>
         </apply>
         <cn type="integer">-1</cn>
        </apply>
       </apply>
       <apply>
        <times/>
        <cn type="integer">-1</cn>
        <apply>
         <times/>
         <ci>k1</ci>
         <ci>y</ci>
        </apply>
       </apply>
      </apply>
     </math>
     <listOfParameters/>
    </kineticLaw>
   </reaction>
   <reaction id="reaction3"
       name="reaction3"
       reversible="true"
       fast="false">
    <listOfReactants>
     <speciesReference species="null"/>
    </listOfReactants>
    <listOfProducts>
     <speciesReference species="z"/>
    </listOfProducts>
    <listOfModifiers>
     <modifierSpeciesReference species="py"/>
    </listOfModifiers>
    <kineticLaw timeUnits="time"
        substanceUnits="substance">
     <math xmlns="http://www.w3.org/1998/Math/MathML">
      <apply>
       <plus/>
       <ci>alpha0</ci>
       <apply>
        <times/>
        <apply>
         <plus/>
         <apply>
          <times/>
          <ci>alpha1</ci>
          <apply>
           <power/>
           <ci>py</ci>
           <ci>n</ci>
          </apply>
         </apply>
         <ci>alpha</ci>
        </apply>
        <apply>
         <power/>
         <apply>
          <plus/>
          <apply>
           <power/>
           <ci>K</ci>
           <ci>n</ci>
          </apply>
          <apply>
           <power/>
           <ci>py</ci>
           <ci>n</ci>
          </apply>
         </apply>
         <cn type="integer">-1</cn>
        </apply>
       </apply>
       <apply>
        <times/>
        <cn type="integer">-1</cn>
        <apply>
         <times/>
         <ci>k1</ci>
         <ci>z</ci>
        </apply>
       </apply>
      </apply>
     </math>
     <listOfParameters/>
    </kineticLaw>
   </reaction>
   <reaction id="reaction4"
       name="reaction4"
       reversible="true"
       fast="false">
    <listOfReactants>
     <speciesReference species="px"/>
    </listOfReactants>
    <listOfProducts>
     <speciesReference species="null"/>
    </listOfProducts>
    <listOfModifiers>
     <modifierSpeciesReference species="x"/>
    </listOfModifiers>
    <kineticLaw timeUnits="time"
        substanceUnits="substance">
     <math xmlns="http://www.w3.org/1998/Math/MathML">
      <apply>
       <times/>
       <apply>
        <times/>
        <cn type="integer">-1</cn>
        <ci>beta</ci>
       </apply>
       <apply>
        <plus/>
        <ci>x</ci>
        <apply>
         <times/>
         <cn type="integer">-1</cn>
         <ci>px</ci>
        </apply>
       </apply>
      </apply>
     </math>
     <listOfParameters/>
    </kineticLaw>
   </reaction>
   <reaction id="reaction5"
       name="reaction5"
       reversible="true"
       fast="false">
    <listOfReactants>
     <speciesReference species="py"/>
    </listOfReactants>
    <listOfProducts>
     <speciesReference species="null"/>
    </listOfProducts>
    <listOfModifiers>
     <modifierSpeciesReference species="y"/>
    </listOfModifiers>
    <kineticLaw timeUnits="time"
        substanceUnits="substance">
     <math xmlns="http://www.w3.org/1998/Math/MathML">
      <apply>
       <times/>
       <apply>
        <times/>
        <cn type="integer">-1</cn>
        <ci>beta</ci>
       </apply>
       <apply>
        <plus/>
        <ci>y</ci>
        <apply>
         <times/>
         <cn type="integer">-1</cn>
         <ci>py</ci>
        </apply>
       </apply>
      </apply>
     </math>
     <listOfParameters/>
    </kineticLaw>
   </reaction>
   <reaction id="reaction6"
       name="reaction6"
       reversible="true"
       fast="false">
    <listOfReactants>
     <speciesReference species="pz"/>
    </listOfReactants>
    <listOfProducts>
     <speciesReference species="null"/>
    </listOfProducts>
    <listOfModifiers>
     <modifierSpeciesReference species="z"/>
    </listOfModifiers>
    <kineticLaw timeUnits="time"
        substanceUnits="substance">
     <math xmlns="http://www.w3.org/1998/Math/MathML">
      <apply>
       <times/>
       <apply>
        <times/>
        <cn type="integer">-1</cn>
        <ci>beta</ci>
       </apply>
       <apply>
        <plus/>
        <ci>z</ci>
        <apply>
         <times/>
         <cn type="integer">-1</cn>
         <ci>pz</ci>
        </apply>
       </apply>
      </apply>
     </math>
     <listOfParameters/>
    </kineticLaw>
   </reaction>
  </listOfReactions>
  <listOfEvents/>
 </model>
</sbml>