Isolation and characterization of influenza virus recombinants with high and low neuraminidase activity. Use of 2-(3'-methoxyphenyl)-n-acetylneuraminic acid to identify cloned populations.

Animals Carbon Radioisotopes Chick Embryo Culture Techniques Electrophoresis, Polyacrylamide Gel Genetic Variation Hemagglutination Tests Hemagglutinins, Viral/analysis Methods Neuraminic Acids Neuraminidase/metabolism Orthomyxoviridae/analysis,enzymology,immunology,isolation & purification Recombination, Genetic Staining and Labeling Tritium Viral Proteins/analysis Virus Cultivation

Carbon Radioisotopes Hemagglutinins, Viral Neuraminic Acids Viral Proteins Tritium Neuraminidase