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Garet P. Lahvis, Randall S. Wells, Douglas W. Kuehl, Jennifer L. Stewart, Howard L. Rhinehart, Charles S. Via, Decreased Lymphocyte Responses in Free-Ranging Bottlenose Dolphins (Tursiops truncatus) Are Associated with Increased Concentrations of PCBs and DDT in Peripheral Blood, Environmental Health Perspectives, Vol. 103, Supplement 4: Wildlife Development (May, 1995), pp. 67-72
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Lahvis et al. (1995) studied this question.
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