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The present study concerns the technical aspects of obtaining the energetics for the E4 state of nitrogenase, the enzyme that fixes N2 in nature. EPR experiments have shown that the critical E4 structure that activates N2 should contain two bridging hydrides in the FeMo‐cofactor. It is furthermore in equilibrium with a structure where the two hydrides have been released and N2 binds. These observations...
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