Humoral immunosuppression in men exposed to polycyclic aromatic hydrocarbons and related carcinogens in polluted environments.

Environ Health Perspect · 1994 · PMC1567104 · PMID 8033871

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showed a trendno p-value reported

In the same subjects, serum IgM had a tendency to decrease, whereas serum IgE showed a trend toward higher values.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.