Glutathione dependent thioredoxin reduction and lipoamide system support in vitro mammalian ribonucleotide reductase catalysis: a possible antioxidant redundancy Molecular Biology Reports Springer Nature Link Thioredoxin reductase Thioredoxin: an antioxidant, a therapeutic target and a possible biomarker Pediatric Research Structure and mechanism of mammalian thioredoxin reductase: The active site is a redox active selenolthiol selenenylsulfide formed from the conserved cysteine selenocysteine sequence PNAS