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Ion channel thiol group (–SH) as a reactive center. Depending on the molecules (e.g., GSH, NO, H2S, or 16-carbon chain palmitate lipid) accessible to a particular −SH group and concomitant modification mechanism, S-glutathionylation, S-nitrosylation, S-sulfhydration, or S-palmitoylation may occur on the ion channel protein. GSH, glutathione; NO, nitric oxide; H2S, hydrogen sulfide.
