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In page Copper in biology:
"A new candidate biomarker for copper excess as well as deficiency has emerged in recent years. This potential marker is a chaperone protein, which delivers copper to the antioxidant protein SOD1 (copper, zinc superoxide dismutase). It is called "copper chaperone for SOD1" (CCS), and excellent animal data supports its use as a marker in accessible cells (e.g., erythrocytes) for copper deficiency as well as excess. CCS is currently being tested as a biomarker in humans.[citation needed]
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