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Differential amino acid reactivity with chemical probes can provide valuable information on the functionality and ligandability of proteins in native biological systems. Here, we present a quantitative, multiplexed chemical proteomic protocol for in-depth reactivity and ligandability profiling of cysteines in proteins in quiescent and stimulated T cells. This protocol illuminates dynamic immune state-dependent alterations in cysteine reactivity, revealing chemoselective and stereoselective small-molecule interactions with cysteines in st