Proteolytic cleavage by plasmin of the HA polypeptide of influenza virus: host cell activation of serum plasminogen.

Amino Acids/metabolism Animals Carbon Radioisotopes Cattle/immunology Cell Line Centrifugation, Density Gradient Chickens Chromatography, Affinity Culture Media Electrophoresis, Polyacrylamide Gel Enzyme Activation Glucosamine/metabolism Hemagglutinins, Viral/analysis Immune Sera Kidney Orthomyxoviridae/analysis,growth & development,metabolism Peptides/analysis,metabolism Plasminogen/metabolism Tritium Trypsin Inhibitors/pharmacology

Amino Acids Carbon Radioisotopes Culture Media Hemagglutinins, Viral Immune Sera Peptides Trypsin Inhibitors Tritium Plasminogen Glucosamine