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Presence of each type and subtype of glutathione peroxidase proteins found in major animal phylum, or subphylum. Red colors: classical GPx; blue colors: monomeric GPx; gray color: classical GPx from invertebrates (cGPxIn); green star: introduction of selenocysteine at the GPx catalytic site; yellow star: supposed arising of classical GPx. Figure created with BioRender.com.
