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Department of Immunology and Medical Microbiology University of Florida College of Medicine Gainesville, Florida, U.S.A.
Vitamin A (retinoic acid) suppressed interferon production by L cells infected with Newcastle disease virus (NDV). This suppression was maximal when cells were treated with retinoic acid for 2 h after NDV adsorption, indicating that the inhibitory step was an early event. It was not due to inhibition of total RNA synthesis. Retinoic acid treatment caused both a delay in appearance of interferon and a reduced rate of synthesis thereafter.
Received 9 February 1976;
accepted 22 March 1976.
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