| Nitrogenase Av1-Av2 complex
      (1n2c) | Active Site Views 
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        Cys97, Cys132
       
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        Cys62, Cys70, Cys88, Cys95, Cys153,
        Cys154, Ser188, Val86
       
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        Cys275, His442, Tyr229
       
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        Push buttonAsp129, Cys132, Cys153, Cys154, Gly133,
        Ile158, Ile159, Leu158, Val130, Val131, Val157
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