Disulfide bond formation by exported glutaredoxin indicates glutathione's presence in the E. coli periplasm PNAS Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation Reactivity of disulfide bonds is markedly affected by structure and environment: implications for protein modification and stability Scientific Reports Glutathione Disulfide Gssg Molecule Oxidized Form Stock Illustration 2629142013 Shutterstock