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Thioredoxin (Trx) (12 kDa M.W.) is a ubiquitous antioxidant protein which controls the oxidative stress and redox signaling with thioredoxin reductase (TrxR) and NADPH. Trx acts as an electron donor for ribonucleotide reductase (RNR), methionine sulfoxide reductase (Msr), and Trx peroxidase (peroxiredoxin). Trx plays an important role in DNA synthesis, reduction of the disulfide bond, recycling of peroxiredoxin (Prx), and as an electron donor. Various in vivo and in vitro assays are used to check the activity of Trx. This work is focused on the study of in vivo and in vitro methods for Trx...