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In page Copper in biology:

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Menkes patients exhibit severe neurological abnormalities, apparently due to the lack of several copper-dependent enzymes required for brain development,[5][6] including reduced cytochrome c oxidase activity.[2] The brittle, kinky hypopigmented hair of steely appearance is due to a deficiency in an unidentified cuproenzyme. Reduced lysyl oxidase activity results in defective collagen and elastin polymerization and corresponding connective-tissue abnormalities including aortic aneurisms, loose skin, and fragile bones.[citation needed]