Studies on mixed infection with Newcastle disease virus. IV. On the structure of heterozygotes.
D000818:Animals; D002499:Centrifugation, Density Gradient; D002642:Chick Embryo; D046508:Culture Techniques; D005347:Fibroblasts; D006579:Heterozygote; D009522:Newcastle disease virus / Q000187:drug effects; D011830:Radiation Effects; D014466:Ultraviolet Rays