[PubMed: 25932639] [PubMed: 36455010] Document what matters Lot number and COA reference Receipt date and initial storage condition Aliquoting date(s) and storage location Freeze-thaw count (if relevant) Any observed changes (color, clumping, unexpected assay drift) Practical do this first checklist Store lyophilized peptides at -20C or below in a dry, temperature-stable environment avoid frost-free freezers
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[6] [7] [10] GPx1 typically uses glutathione (GSH) as the reductant, but when glutathione synthetase (GSS) is, as in brain mitochondria, -glutamylcysteine can serve as the reductant instead