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White Leghorn eggs (n = 60) were exposed to 20 kHz at 0.011, 0.11, or 1.1 milliT during the first 2, 7, or 11 days of embryogenesis. All-trans-retinoic acid was also used as a control for teratogenesis. The authors report no effect on mortality and development, either alone or in combination with retinoic acid treatment. |