There is an additional anisotropic contribution of the electron‐nucleus dipolar coupling which, in contrast to the PCSs, is averaged by MAS, but still might be significant for residues in close vicinity to the metal center at typical MAS frequencies used ( vide infra ).
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Paramagnetic Solid-State NMR to Localize the Metal-Ion Cofactor in an Oligomeric DnaB Helicase.
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