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A) Representation of TAM-based spin labels, FT-MTSL, OX063-d24-MTSL, mOX063-d24, and Ox-SLIM. B) Three-dimensional model of E15C/K28C GB1 based on the wild-type GB1 crystal structure (PDB:2QMT). The side chains of the mutated cysteines are represented as lines.
