Anomalous response of certain chicken embryo to various inocula. II. Evidence of a biological agent associated with resistance to rous sarcoma virus infection.
D000818:Animals; D002642:Chick Embryo; D005321:Extraembryonic Membranes; D007106:Immune Sera; D001357:Sarcoma, Avian / Q000276:immunology / Q000662:veterinary*
D007106:Immune Sera