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Peripheral blood lymphocytes, serum immunoglobulins (IgG, IgA and IgM), C3 and C4 complement protein concentrations of 25 male lead-exposed workers from storage-battery plants were examined and compared to 25 healthy male controls. Lead exposure was assessed using blood lead levels measured by atomic absorption spectrophotometry and zinc protoporphyrin (ZPP) levels assayed by hematofluorometry. ...
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