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Depiction of thiosulfinate (A), thiosulfonate (B) and α-disulfoxide (C) oxygen adducts. In CstR, the oxygen adducts have been assigned to the Sγ of Cys31 and Cys60 as either thiosulfonate or α-disulfoxide (Fig. S3A). R and R′ are not defined as Cys31 or Cys60 as they can not be distinguished.
