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ar sensor that can detect trypanothione. The sensor includes a fluorescent protein, which changes its brightness based on its oxidation state, fused to the tryparedoxin protein. This probe could either be put in the cytosol or mitochondrion of Trypanosoma brucei cells. Treating the cells with hydrogen peroxide changed the fluorescence of the biosensor. Trypanosoma brucei cells without tryparedoxin protein in their cytosol still responded to an oxidative challenge in the mitochondrion. The experiments reveal that trypanosomes do have a mi