A spin label is a stable free radical used in various fields of scientific research, particularly in electron spin resonance (ESR) spectroscopy and magnetic resonance imaging (MRI). Spin labels are typically small, organic molecules that contain unpaired electrons, which give them magnetic properties. In biological and chemical studies, spin labels are often attached to specific sites in macromolecules, such as proteins or membranes, allowing researchers to study molecular environments, dynamics, and interactions at a molecular level.
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