Unpaired electrons can exert effects that allow interatomic contacts in molecules to be detected more easily using nuclear magnetic resonance. One such effect reveals unusual interactions between certain atoms in a protein.
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Bertini, I., Luchinat, C. Unexpected interactions. Nature 470, 469–470 (2011). https://doi.org/10.1038/470469a
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DOI: https://doi.org/10.1038/470469a