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While necessary for structural purposes, these strong linkages between cysteine residues render keratin indigestible to humans and thus unavailable for absorption
Glutathione reductase (GR), an NADPH-dependent enzyme, continuously regenerates reduced glutathione (GSH) from its oxidized form (GSSG), thereby maintaining the intracellular reducing environment required for effective antioxidant defense, proper enzymatic activity, and redox-dependent signaling pathways [36]
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