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Spin label
A
spin label
(SL) is an
organic molecule
which possesses an unpaired
electron
, usually on a
nitrogen
atom, and the ability to bind to another molecule. Spin labels are normally used as tools for probing
proteins
or
biological membrane
-local dynamics using
electron paramagnetic resonance
spectroscopy. The
site-directed spin labeling
(SDSL) technique allows one to monitor a specific region within a protein. In protein structure examinations,
amino acid
-specific SLs can be used.
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