Counteraction between interferon and enhancer.
D000818:Animals; D002642:Chick Embryo; D066298:In Vitro Techniques; D007372:Interferons / Q000494:pharmacology*; D018108:Respirovirus / Q000254:growth & development*; D014020:Tissue Extracts / Q000494:pharmacology*; D014776:Virus Cultivation
D014020:Tissue Extracts; D007372:Interferons