A total of seven biomarkers of protein nonenzymatic modifications indicating oxidative stress were detected, as described previously [43]
Methanol (VWR Chemicals), formic acid (Sigma-Aldrich, West Chester, PA, USA) & DMSO Sigma-Aldrich (West Chester, PA, USA), NADPH (Merk, USA)
Meaningful price premium is justified by: verified copper tripeptide-1 concentration (not just "copper peptide complex"), stable packaging (airless or amber glass), a pH between 5.5 and 7.0 confirmed by the brand, absence of destabilizing ingredients like high-dose vitamin C in the same formula, and a third-party COA for the active ingredient
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Tissues were blocked in CAS block (Thermo Fisher Scientific) and incubated overnight with primary antibodies diluted in CAS block (Cell Signaling, F4/80 Rabbit mAb 70076, 1:250)