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. Author manuscript; available in PMC: 2008 Aug 27.
Published in final edited form as: Biochemistry. 2006 Oct 17;45(41):12539–12546. doi: 10.1021/bi060830a

Figure 2.

Figure 2

The sulfhydryl-specific spin label MTSL is reacted directly with the introduced cysteine residue to form a covalent disulfide bond between the protein and the spin label.