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MAGNESIUM(II)-AND ZINC(II)-PROTOPORPHYRIN IX'S STABILIZE THE LOWEST OXYGEN AFFINITY STATE OF HUMAN HEMOGLOBIN EVEN MORE STRONGLY THAN DEOXYHEME
1QSH

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     HEG View Pocket in
    Jmol
    HEG PROTOPORPHYRIN IX CONTAINING MG C34 H32 Mg N4 O4
     HEM View Pocket in
    Jmol
    HEM PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4
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