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In page Copper in biology:

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Several rare genetic diseases (Wilson disease, Menkes disease, idiopathic copper toxicosis, Indian childhood cirrhosis) are associated with the improper use of copper in the body.[1] All of these diseases involve mutations of genes containing the genetic codes for the production of specific proteins involved in the absorption and distribution of copper. When these proteins are dysfunctional, copper either builds up in the liver or the body fails to absorb copper.[citation needed]