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Covalent protein labeling at the protein mediated by coiled‐coil peptide heterodimers. A protein of interest (POI, grey box) tagged with a peptide recognition tag (green) at the N terminus is selectively labeled with a cargo (red star) by means of a proximity‐triggered reaction. Covalent protein labeling is achieved by chloroacetyl crosslinking (A), sulfosuccinimidyl ester crosslinking (B) or templated acyl transfer (C).
