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Site-directed spin labeling (SDSL) in combination with electron paramagnetic resonance (EPR) spectroscopy allows studying the structure, dynamics, and interactions of proteins via distance measurements in the nanometer range. We here give an overview of available spin labels, the strategies for their introduction into proteins, and the associated potentials for protein structural studies in vitro and in the context of living cells.
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Roser et al. (2016) studied this question.
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