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Functioning mechanism of the ScCsoR‐pivoted gene circuit. Reduced ScCsoR (Cys37‐SH) binds to the promoters of Scpdo (P1), SccsoR (P2) and rhod (P3) and inhibits their expression. When the intracellular sulfane sulfur level reaches its threshold, ScCsoR is sulfhydrated (Cys37‐SSH) by sulfane sulfur and dissociates from the promoters, allowing the expression of these genes until the intracellular sulfane sulfur level drops below the threshold.
