<p>This redoxin domain is found in peroxiredoxin, thioredoxin and glutaredoxin proteins. Peroxiredoxins (Prxs) constitute a family of thiol peroxidases that reduce hydrogen peroxide, peroxinitrite, and hydroperoxides using a strictly conserved cysteine [<cite idref="PUB00037757"/>]. Chloroplast thioredoxin systems in plants regulate the enzymes involved in photosynthetic carbon assimilation [<cite idref="PUB00043349"/>]. It is thought that redoxins have a large role to play in anti-oxidant defence. Cadmium-sensitive proteins are also regulated via thioredoxin and glutaredoxin thiol redox systems [<cite idref="PUB00043350"/>].</p>