“…Cleavage products were indicated with arrows the sequence, Cys-Gly-Pro-Cys, are necessary for the redox function of thioredoxin (Arner and Holmgren, 2000). Several thioredoxins or thioredoxin-like proteins exist in mammalian cells (Kurooka et al, 1997;Lee et al, 1998b;Spyrou et al, 1997), whose individual physiologic roles have not been clearly understood. The most-well characterized member of these thioredoxins, Trx1, is critical for mammalian development because a homozygous deletion of this gene causes embryonic lethality in mice (Matsui et al, 1996).…”