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GPX5 does not contain selenium cysteine (Secys) at its active site, but instead uses cysteine residues (Cys) as its active site
-Tocopherol is also likely involved in strengthening certain aspects of cell-mediated immunity
By age 60, that concentration has fallen to approximately 80 ng/mL, a 60% decline that correlates directly with reduced healing capacity, collagen loss, and visible aging
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