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Diagram of the reaction mechanisms in the formation of CysSSH and polysulfides, as catalysed by CARSs. During the formation of cysteine persulfides, sulfur atoms are cleaved from donor cysteine (Substrate‐1) and transferred to acceptor cysteine (Substrate‐2) to form the cysteine persulfide (Product‐1). Subsequent transfer of sulfur to Product‐1 forms cysteine trisulfide (Product‐2). CysSH, cysteine; CysSSSH, cyeteine hydrotrisulfide.
