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As of 2026, the paper has not been formally retracted, but the Expression of Concern remains in force

While the Clade 2 GS enzyme tested clearly has a slower rate of canonical enzyme activity than the Clade 1 GS, it can nevertheless synthesise glutathione: It has a high affinity for the -EC dipeptide substrate, and a preference for glycine as the terminal amino acid despite a lack of conservation in the two residues that apparently contribute to this specificity

This comprehensive information allows our team of regenerative experts to assess the eligibility of Graves disease patients for our specialized treatment protocols, ensuring that those who can benefit most are given the best possible care [51-54]

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