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A novel workflow was designed for the large-scale identification of protein N-terminal sequences. The workflow started with converting lysine to homoarginine, followed by reaction with sulfonation of N-termini by 4-sulfophenyl isothiocyanate (SPITC). Upon trypsin digestion, the SPITC modified N-terminal peptides were enriched by electrostatic repulsion hydrophilic interaction (ERLIC) chromatography...
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