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Durieux AM, Fernandes C, Murphy D, Labouesse MA, Giovanoli S, Meyer U et al (2015)

-Glutamyl transpeptidase, which is abundant on the apical surface of most transporting epithelia, including liver canalicular and bile ductular membranes, is the only enzyme that can initiate catabolism of GSH and GSH-containing molecules (e.g., GSSG, glutathione S -conjugates, and glutathione-complexes) under physiological conditions

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Iolascon A, Miraglia del Giudice E, Perrotta S, Granatiero M, Zelante L, Gasparini P

You cleanse, moisturise, apply serums and yet your skin still looks dull, uneven, and older than you feel