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In page Copper in biology:

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Dermal exposure has not been associated with systemic toxicity but anecdotal reports of allergic responses may be a sensitization to nickel and cross-reaction with copper or a skin irritation from copper.[11] Workers exposed to high air levels of copper (resulting in an estimated intake of 200 mg Cu/d) developed signs suggesting copper toxicity (e.g., elevated serum copper levels, hepatomegaly). However, other co-occurring exposures to pesticidal agents or in mining and smelting may contribute to these effects.[11] Effects of copper inhalation are being thoroughly investigated by an industry-sponsored program on workplace air and worker safety. This multi-year research effort is expected to be finalized in 2011.[citation needed]