${\displaystyle {\underset {Oxygen}{O2}}->{\underset {Superoxide}{*O2^{-}}}->[{{} \atop {\ce {Superoxide \atop dismutase}}}]{\underset {Hydrogen \atop peroxide}{H2O2}}->[{{} \atop {\ce {Peroxidases \atop catalase}}}]{\underset {Water}{H2O}}}$

In your article, replace the image with:

<math chem>\underset{Oxygen}{O2} -> \underset{Superoxide}{*O2^-} ->[{ {} \atop \ce{Superoxide \atop dismutase} }] \underset{Hydrogen \atop peroxide}{H2O2} ->[{ {} \atop \ce{Peroxidases \atop catalase} }] \underset{Water}{H2O}</math>

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