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and impaired resistance to viral infections. And 6. Exposure to arsenic has <br />been associated with different types of human cancers such as respiratory <br />cancers and epidermoid carcinomas of the skin, as well as precancerous dermal <br />keratosis. Only recently (Deknudt et al. 1986) has the epidemiological <br />evidence of human carcinogenicity been confirmed by carcinogenesis in <br />experimental animals. <br />This report was prepared in response to requests for information from <br />environmental contaminant specialists of the U. S. Fish and Wildlife Service. <br />It is part of a continuing series of reviews on chemical pollutants and <br />natural resources. <br />2