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Chicks (n=22, 1 week of age) were operantly conditioned to activate either a heating bulb or a microwave source (2450 MHz CW at 13 mW/cm2) for heat. No effects were observed between IR vs RF heated groups in corticosterone, general morphological or pathological endpoints, weight of spleen or bursa, histological examination of spleen, bursa, adrenal, thyroid tissue, or immune cell counts. The authors conclude that the RF exposure used in this study did not result in stress or immunological disturbances.
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