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The pattern of breakdown is very different for the two types of nucletide bases, purines and pyrimidines.  In the case of pyrimidines the ring is reduced and then opened, and with the exception of beta-alanine the nitrogen is removed by deamination and transamination as ammonia, which must ultimately be converted into urea.  However, in the case of purines only the amino nitrogen outside the ring is removed as ammonia.  The purine ring itself is oxidized to uric acid by xanthine oxidase and excreted.  In humans and primates, the conversion of urate to allantoin occurs non-enzymatically by interaction with oxygen free radicals.
free text=Biochemiscal Pathways - An Atlas of Biochemistry and Molecular Biology Edited by Gerhard Michal
free text=Color Atlas of Biochemistry by Jan Koolman and Klaus-Heinrich Rohm
free text=Human Metabolism by Ramsey Bronk
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<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>H_sub_2_endsub_O</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s183" initialAmount="0.0" name="P_sub_i_endsub_">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Pi
Synonym:  Synonym not specified
Accession:  S04096
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>P_sub_i_endsub_</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s3" initialAmount="0.0" name="UMP">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  UMP
Synonym:  Synonym not specified
Accession:  S04080
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>UMP</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s194" initialAmount="0.0" name="CMP">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  CMP
Synonym:  Synonym not specified
Accession:  S04083
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>CMP</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s195" initialAmount="0.0" name="dTMP">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  dTMP
Synonym:  Synonym not specified
Accession:  S04074
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>dTMP</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s196" initialAmount="0.0" name="Cytidine">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Cytidine
Synonym:  Synonym not specified
Accession:  S04094
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>Cytidine</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s197" initialAmount="0.0" name="Uridine">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Uridine
Synonym:  Synonym not specified
Accession:  S04078
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>Uridine</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s198" initialAmount="0.0" name="Uracil">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Uracil
Synonym:  Synonym not specified
Accession:  S04091
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>Uracil</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s199" initialAmount="0.0" name="Dihydrouracil">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Dihydrouracil
Synonym:  Synonym not specified
Accession:  S04086
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>Dihydrouracil</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s203" initialAmount="0.0" name="Thymidine">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Thymidine
Synonym:  Synonym not specified
Accession:  S04095
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>Thymidine</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s204" initialAmount="0.0" name="Thymine">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Thymine
Synonym:  Synonym not specified
Accession:  S04081
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>Thymine</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s205" initialAmount="0.0" name="Dihydrothymine">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Dihydrothymine
Synonym:  Synonym not specified
Accession:  S04070
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>Dihydrothymine</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s207" initialAmount="0.0" name="_Beta_-Alanine">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Beta-Alanine
Synonym:  Synonym not specified
Accession:  S04087
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>_Beta_-Alanine</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s208" initialAmount="0.0" name="_Beta_-Ureidopropionate">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Beta-Ureidopropionate
Synonym:  Synonym not specified
Accession:  S04088
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>_Beta_-Ureidopropionate</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s209" initialAmount="0.0" name="_Beta_-Ureidoisobutyrate">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Beta-Ureidoisobutyrate
Synonym:  Synonym not specified
Accession:  S04084
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>_Beta_-Ureidoisobutyrate</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s210" initialAmount="0.0" name="Methylmelonate_br_semialdehyde">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Methylmelonate semialdehyde
Synonym:  Synonym not specified
Accession:  S04076
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>Methylmelonate_br_semialdehyde</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s211" initialAmount="0.0" name="Methylmelonyl-CoA">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Methylmelonyl-CoA
Synonym:  Synonym not specified
Accession:  S04082
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>Methylmelonyl-CoA</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s212" initialAmount="0.0" name="Succinyl-CoA">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Succinyl-CoA
Synonym:  Synonym not specified
Accession:  S04069
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>Succinyl-CoA</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s213" initialAmount="0.0" name="Ribose-1-Phosphate">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Ribose-1-Phosphate
Synonym:  Synonym not specified
Accession:  S04085
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>Ribose-1-Phosphate</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s214" initialAmount="0.0" name="_Beta_-Aminoisobutyrate">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Beta-Aminoisobutyrate
Synonym:  Synonym not specified
Accession:  S04072
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>_Beta_-Aminoisobutyrate</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s215" initialAmount="0.0" name="5_super_'_endsuper_-Nucleotidase">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  5'-Nucleotidase
Synonym:  Synonym not specified
Accession:  P03131
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>PROTEIN</celldesigner:class>
<celldesigner:proteinReference>p65</celldesigner:proteinReference>
</celldesigner:speciesIdentity>
<celldesigner:listOfCatalyzedReactions>
<celldesigner:catalyzed reaction="r87"/>
<celldesigner:catalyzed reaction="r90"/>
<celldesigner:catalyzed reaction="r92"/>
</celldesigner:listOfCatalyzedReactions>
</annotation>
</species>
<species compartment="default" id="s216" initialAmount="0.0" name="Cytidine Deaminase">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Cytidine Deaminase
Synonym:  Synonym not specified
Accession:  P03130
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>PROTEIN</celldesigner:class>
<celldesigner:proteinReference>p66</celldesigner:proteinReference>
</celldesigner:speciesIdentity>
<celldesigner:listOfCatalyzedReactions>
<celldesigner:catalyzed reaction="r91"/>
</celldesigner:listOfCatalyzedReactions>
</annotation>
</species>
<species compartment="default" id="s217" initialAmount="0.0" name="Nucleoside_br_Phosphorylase">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Nucleoside Phosphorylase
Synonym:  Synonym not specified
Accession:  P03126
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>PROTEIN</celldesigner:class>
<celldesigner:proteinReference>p67</celldesigner:proteinReference>
</celldesigner:speciesIdentity>
<celldesigner:listOfCatalyzedReactions>
<celldesigner:catalyzed reaction="r88"/>
<celldesigner:catalyzed reaction="r93"/>
</celldesigner:listOfCatalyzedReactions>
</annotation>
</species>
<species compartment="default" id="s219" initialAmount="0.0" name="NAD_super_+">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  NAD+
Synonym:  Synonym not specified
Accession:  S04071
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>NAD_super_+</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s220" initialAmount="0.0" name="NADH + H_super_+">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  NADH + H+
Synonym:  Synonym not specified
Accession:  S04089
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>NADH + H_super_+</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s221" initialAmount="0.0" name="Dihydrouracil_br_Dehydrogenase">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Dihydrouracil Dehydrogenase
Synonym:  Synonym not specified
Accession:  P03128
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>PROTEIN</celldesigner:class>
<celldesigner:proteinReference>p68</celldesigner:proteinReference>
</celldesigner:speciesIdentity>
<celldesigner:listOfCatalyzedReactions>
<celldesigner:catalyzed reaction="r89"/>
<celldesigner:catalyzed reaction="r94"/>
</celldesigner:listOfCatalyzedReactions>
</annotation>
</species>
<species compartment="default" id="s223" initialAmount="0.0" name="NH_sub_4_endsub_ _super_+_endsuper_ + CO_sub_2_endsub">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  NH4 + + CO2
Synonym:  Synonym not specified
Accession:  S04092
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>NH_sub_4_endsub_ _super_+_endsuper_ + CO_sub_2_endsub</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s224" initialAmount="0.0" name="Dihydropyrimidinase">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Dihydropyrimidinase
Synonym:  Synonym not specified
Accession:  P03125
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>PROTEIN</celldesigner:class>
<celldesigner:proteinReference>p69</celldesigner:proteinReference>
</celldesigner:speciesIdentity>
<celldesigner:listOfCatalyzedReactions>
<celldesigner:catalyzed reaction="r95"/>
<celldesigner:catalyzed reaction="r100"/>
</celldesigner:listOfCatalyzedReactions>
</annotation>
</species>
<species compartment="default" id="s226" initialAmount="0.0" name="_Beta_-Ureidopropionase">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Beta-Ureidopropionase
Synonym:  Synonym not specified
Accession:  P03127
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>PROTEIN</celldesigner:class>
<celldesigner:proteinReference>p71</celldesigner:proteinReference>
</celldesigner:speciesIdentity>
<celldesigner:listOfCatalyzedReactions>
<celldesigner:catalyzed reaction="r96"/>
<celldesigner:catalyzed reaction="r101"/>
</celldesigner:listOfCatalyzedReactions>
</annotation>
</species>
<species compartment="default" id="s227" initialAmount="0.0" name="2-Deoxyribose-1-Phosphate">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  2-Deoxyribose-1-Phosphate
Synonym:  Synonym not specified
Accession:  S04079
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>2-Deoxyribose-1-Phosphate</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s228" initialAmount="0.0" name="2-Oxoglutarate">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  2-Oxoglutarate
Synonym:  Synonym not specified
Accession:  S04073
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>2-Oxoglutarate</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s229" initialAmount="0.0" name="Glutamate">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Glutamate
Synonym:  Synonym not specified
Accession:  S04075
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>Glutamate</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s230" initialAmount="0.0" name="Aminotransferase">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Aminotransferase
Synonym:  Synonym not specified
Accession:  P03129
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>PROTEIN</celldesigner:class>
<celldesigner:proteinReference>p72</celldesigner:proteinReference>
</celldesigner:speciesIdentity>
<celldesigner:listOfCatalyzedReactions>
<celldesigner:catalyzed reaction="r97"/>
</celldesigner:listOfCatalyzedReactions>
</annotation>
</species>
<species compartment="default" id="s231" initialAmount="0.0" name="CoA-SH + NAD_super_+">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  CoA-SH + NAD+
Synonym:  Synonym not specified
Accession:  S04077
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>SIMPLE_MOLECULE</celldesigner:class>
<celldesigner:name>CoA-SH + NAD_super_+</celldesigner:name>
</celldesigner:speciesIdentity>
</annotation>
</species>
<species compartment="default" id="s232" initialAmount="0.0" name="Methylmalonate_br_Semialdehyde_br_Dehydrogenase">
<notes>
<html xmlns="http://www.w3.org/1999/xhtml">
<!--Notes by CellDesigner-->
<body>
Long Name:  Methylmalonate Semialdehyde Dehydrogenase
Synonym:  Synonym not specified
Accession:  P03124
</body>
</html>
</notes>
<annotation>
<celldesigner:positionToCompartment>inside</celldesigner:positionToCompartment>
<celldesigner:speciesIdentity>
<celldesigner:class>PROTEIN</celldesigner:class>
<celldesigner:proteinReference>p73</celldesigner:proteinReference>
</celldesigner:speciesIdentity>
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<celldesigner:alias>a197</celldesigner:alias>
</annotation>
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<modifierSpeciesReference species="s224">
<annotation>
<celldesigner:alias>a227</celldesigner:alias>
</annotation>
</modifierSpeciesReference>
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<celldesigner:reactionType>STATE_TRANSITION</celldesigner:reactionType>
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<celldesigner:baseProducts>s207</celldesigner:baseProducts>
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<celldesigner:reactantLink alias="a225" reactant="s180" targetLineIndex="-1,1"/>
</celldesigner:listOfReactantLinks>
<celldesigner:listOfProductLinks>
<celldesigner:productLink alias="a226" product="s223" targetLineIndex="-1,1"/>
</celldesigner:listOfProductLinks>
<celldesigner:editPoints>0.33333333333333326,-2.220446049250313E-16 0.666666666666667,-6.661338147750939E-16</celldesigner:editPoints>
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<celldesigner:modification aliases="a229" editPoints="0.3333333333333339,-8.881784197001252E-16 0.666666666666667,-8.881784197001252E-16" modifiers="s226" targetLineIndex="-1,2" type="CATALYSIS"/>
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</annotation>
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<speciesReference species="s208">
<annotation>
<celldesigner:alias>a197</celldesigner:alias>
</annotation>
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<speciesReference species="s180">
<annotation>
<celldesigner:alias>a225</celldesigner:alias>
</annotation>
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<speciesReference species="s207">
<annotation>
<celldesigner:alias>a198</celldesigner:alias>
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<annotation>
<celldesigner:alias>a226</celldesigner:alias>
</annotation>
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<modifierSpeciesReference species="s226">
<annotation>
<celldesigner:alias>a229</celldesigner:alias>
</annotation>
</modifierSpeciesReference>
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<celldesigner:reactionType>KNOWN_TRANSITION_OMITTED</celldesigner:reactionType>
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<celldesigner:baseProducts>s212</celldesigner:baseProducts>
<celldesigner:editPoints>0.3333333333333335,-8.881784197001252E-16 0.6666666666666665,0.0</celldesigner:editPoints>
</annotation>
<listOfReactants>
<speciesReference species="s211">
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<celldesigner:alias>a206</celldesigner:alias>
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<listOfProducts>
<speciesReference species="s212">
<annotation>
<celldesigner:alias>a207</celldesigner:alias>
</annotation>
</speciesReference>
</listOfProducts>
</reaction>
</listOfReactions>
</model>
</sbml>

