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High concentrations of ascorbic acid can destabilize copper peptides, reducing their effectiveness

The SLC7A11-containing cystine/glutamate antiporter system xc supports cysteine availability after imported cystine is reduced, although its contribution depends on nutrient conditions and transporter expression (Jyotsana et al., 2022)

Its short sequence Gly-His-Lys binds Cu2+ ions with exceptional affinity through the histidine imidazole ring and the terminal amine, forming the characteristic blue complex

While this chapter wasn't one I anticipated closing, it has reinforced something I've always believed: careers are not defined by titles, but they are defined by impact, relationships, resilience, and the value we create along the way